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DAAT · LEVEL 4 — DAAT HARAV (CHABAD) & HALACHA LEMA'ASSE

שולחן ערוך · יורה דעה

Siman 185 — The Woman's Word About Her Status (Ne'emanut): "VeSafrah Lah," the Amatla, and Becoming Niddah During Relations

סימן קפ״ה · דעת הרב והלכה למעשה

נאמנות האשה ואמתלא

שיטת הצמח צדק וחב״ד · פסק הבית יוסף והרמ״א · נושאי הכלים והפוסקים בזמננו

🕯️ דעת הרב · פסק הלכה ולמעשה 🕯️

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Daat HaRav (Chabad) & Halacha lema'asse

The shitah of the Tzemach Tzedek and Chabad on ne'emanut and Niddah,
then the halacha lema'asse of the nossei kelim and the contemporary poskim

Subject:
שולחן ערוך יורה דעה סימן קפ״ה (ד' סעיפים)
נאמנות האשה: « וספרה לה », אמתלא, החכם נאמן, ונטמאתי בשעת תשמיש

Register:
Taharat haMishpacha is an intimate and weighty subject.
We expose the sugya and the shitot ; we never rule on a personal case.
For any application: consult your Rav (or a Chabad Rav / Dayan / a Yoetzet).

Writing and iyun:
הרב יוסף חיים סממה · DAAT

How to read this level. The heart of Siman 185 is ne'emanut (the trust granted to the woman): the entire system of Taharat haMishpacha rests on her word — "וספרה לה," "she counts for herself." The siman has four seifim: a woman presumed niddah who is believed once she says "טבלתי" (I have immersed) ; a woman established as niddah before her neighbors ; the case of one who says "I am tamei" then "I am tahor" and the force of the amatla ; and the grave case of becoming niddah during relations (נטמאתי). This level has two parts. (1) Daat HaRav — the Chabad shitah: unlike kashrut, here there is a genuine Chabad halakhic tradition, whose authority of reference on Niddah is the Tzemach Tzedek. (2) Halacha lema'asse: the general pesak (Beit Yossef, Rama, Shach, Taz, Sidrei Tahara, Chochmat Adam, Aruch haShulchan, Beit Shmuel, Chatam Sofer) and the contemporary pesak (Taharat haBayit, Shevet haLevi, Badei haShulchan). We cite only real and attested positions ; where a specific Chabad ruling is not established with certainty, we present it at the level of principle. This siman touches an especially intimate and weighty subject ; every concrete application (lema'asse) concludes with the referral to your Rav (or a Chabad Rav / Dayan): this subject is never decided alone.

📑 תוכן העניינים

שורש הסימן — נאמנות האשה ו« וספרה לה » (ד' סעיפים)
פסק המחבר והרמ״א — מסגרת הנאמנות והאמתלא
שיטת הצמח צדק וחב״ד — דעת הרב על הנאמנות והנדה
יסוד הנאמנות — « וספרה לה לעצמה » וחזקת טהרה (ש״ך)
האמתלא וגבולותיה — דיבור ולא מעשה ; ל' יום (בית שמואל)
החכם נאמן ועד אחד — איסורין מול ממון (פתחי תשובה)
נטמאתי בשעת תשמיש — אבר מת, כרת, תשובת השוגג, אונס
פסיקת הספרדים בזמננו — טהרת הבית, ילקוט יוסף
פסיקת האשכנזים — סדרי טהרה, ערוך השולחן, שבט הלוי
מקרים מודרניים — נאמנות, אמתלא, ונטמאתי (בצניעות)
סיכום מעשי וטבלאות — ולמעשה, שאל את רבך

📜 The Text of the Shulchan Aruch — The Opening (ד' סעיפים)

הָאִשָּׁה שֶׁהִיא בְּחֶזְקַת טְמֵאָה אָסוּר לוֹ לָבֹא עָלֶיהָ עַד שֶׁתֹּאמַר לוֹ טָבַלְתִּי. הגה: וּמֵאַחַר שֶׁעָבְרוּ יָמִים שֶׁאֶפְשָׁר לָהּ לִמְנוֹת וְלִטְבֹּל — נֶאֱמֶנֶת, אֲפִלּוּ רוֹאָה בְגָדֶיהָ מְלֻכְלָכִים בְּדָם.

אָמְרָה לְבַעְלָהּ טְמֵאָה אֲנִי וְאַחַר כָּךְ אָמְרָה טְהוֹרָה אֲנִי — אֵינָהּ נֶאֱמֶנֶת (אִם הוּא לְאַחַר כְּדֵי דִבּוּר) ; וְאִם נָתְנָה אֲמַתְלָא לִדְבָרֶיהָ — נֶאֱמֶנֶת.

The principle (ne'emanut). A woman who is בחזקת טמאה (presumed niddah): she is forbidden to him until she says "טבלתי" (I have immersed). Rama: once the time to count and to immerse could have elapsed, she is believed — even if her garments are stained with blood, she is believed to say "I passed through the butchers' market" or "I handled a bird."

She said "I am tamei" then "I am tahor" → she is not believed (after kedei dibbur) ; unless she gives an amatla (a plausible explanation) for her first statement — then she is believed.

— Shulchan Aruch, Yoreh De'ah 185:1-3 (of ד' seifim) · Talmudic basis: נדה ; כתובות (single witness, the chacham) · Sefaria YD 185:1

1. שורש הסימן — Ne'emanut, the Foundation of the Home

The foundation. Siman 185 is no marginal case: it lays the bedrock of all of Taharat haMishpacha — נאמנות, the trust granted to the woman. The verse "וספרה לה" (Vayikra 15:28) — "she shall count for herself" — establishes the principle: the woman counts her days, examines, and declares her status, and the husband relies on her word (Shach). The couple is not in surveillance but in trust. (1) A woman בחזקת טמאה → forbidden until "טבלתי." (2) Established as niddah before her neighbors → certainly tamei. (3) "Tamei" then "tahor" → the force of the amatla. (4) נטמאתי during relations → a grave case.

Chazakah and ne'emanut — the mechanics. The siman joins two notions. (1) The חזקה: a woman בחזקת טמאה remains so until a new fact changes her status ; this is why she must explicitly say "טבלתי" — the Pitchei Teshuva (s.k. 1) notes that even lying beside him, she must say it. (2) נאמנות: the Torah entrusted to the woman the knowledge of her own body and her count ; for what is in her hands ("בידה"), her word holds. This is a particular ne'emanut, distinct from an ordinary single witness.

Established as niddah — when the word no longer suffices (seif 2)

There is a limit to ne'emanut. If the woman הוחזקה נדה — that she was seen by the neighbors wearing the בגדים המיוחדים לימי נדותה (the garments reserved for her niddah days) — she is חשובה כודאי טמאה: a public fact (ma'aseh) has established her niddah status, and her word alone no longer undoes it. This is the seed of the great distinction of the siman: a statement (dibbur) is retracted with an amatla ; a deed (ma'aseh) is not.

2. פסק המחבר והרמ״א — The Map of the Siman

Siman 185 has four seifim. The Mehaber sets the principle of ne'emanut ("טבלתי" ; believed even with stained garments via the Rama's amatla in seif 1), the limit of "established as niddah," the case of "tamei" then "tahor" and the amatla, then the grave case of נטמאתי. The Rama (הגה) adds decisive points. Here is the map.

Seif	Concept	Ruling (anchored in the text)
1	"Tavalti" and the amatla	A woman בחזקת טמאה → forbidden until "טבלתי." Rama: once the time to count and immerse has elapsed, she is believed even with stained garments (amatla: "the butchers' market," "I handled a bird"). Shach: "וספרה לה לעצמה" — if the husband does not know whether the days have passed, he relies on her.
2	Established as niddah	Seen by the neighbors wearing the garments reserved for her niddah days → considered certainly tamei. A public deed undoes the ne'emanut of the word alone.
3	"Tamei" then "tahor" + amatla	"I am tamei" then "I am tahor" → not believed (after kedei dibbur), unless an amatla (weakness, or a quarrel — קטטה). Rama: the one who is stringent = midat chasidut, but מדינא she is believed even in silence. But if seen wearing the niddah garments → not believed even with an amatla ; and if a chacham ruled and says she lies → the chacham is believed and she is tamei.
4	נטמאתי during relations	She said "I have become niddah" and he withdrew at once → liable to karet (יציאתו הנאה לו כביאתו). How to act: he presses his toes into the ground, motionless without movement until the ever dies, then withdraws באבר מת. Rama: fear and trembling ; if he withdrew בקשוי בשוגג → 40 days of fasting or פדיון through tzedakah ; the woman needs no atonement ; outside the וסת with blood found afterward → ones.

כלל הפסק של הסימן :
כָּל טָהֳרַת הַמִּשְׁפָּחָה נִבְנֵית עַל נאמנות האשה — « וספרה לה לעצמה » : הִיא סוֹפֶרֶת, בּוֹדֶקֶת וְאוֹמֶרֶת, וְהַבַּעַל סוֹמֵךְ עָלֶיהָ. דיבור נֶחֱזָר באמתלא ; אֲבָל מעשה (הוחזקה נדה) אֵינוֹ נֶחֱזָר. וְהַחכם שֶׁטִּהֵר וְאָמַר שֶׁמְּשַׁקֶּרֶת — נֶאֱמָן. וּנטמאתי בִּשְׁעַת תַּשְׁמִישׁ — אֵימָה גְדוֹלָה, וּפוֹרֵשׁ בְּאֵבֶר מֵת.

3. שיטת הצמח צדק וחב״ד — Daat HaRav

Note on method (important). This part presents the Chabad halakhic approach to ne'emanut and Niddah. Unlike kashrut, here there is a genuine tradition of Chabad pesak. We present it at the level of principle and of the authorities ; we attribute to the Tzemach Tzedek and to no Rebbe any specific ruling, responsum number, or minhag that we could not verify. For the detail of a case, the Chabad practice is to turn to a Chabad Rav or a Dayan.

The Tzemach Tzedek — Chabad's authority of reference on Niddah

The Tzemach Tzedek — Rabbi Menachem Mendel Schneersohn (1789-1866), the third Rebbe of Lubavitch and grandson of the Admur HaZaken — is the foremost posek of Chabad, in particular in Taharat haMishpacha. His collection of responsa and pisqei dinim (the Shut Tzemach Tzedek) covers Yoreh De'ah and the laws of Niddah extensively, and it is to him that the Chabad tradition turns first for these questions. At the level of principle, the Chabad school is characterized by great stringency in Taharat haMishpacha and by particular care for the woman's ne'emanut and for the conduct of grave cases.

Daat HaRav and the heart of the siman. On the very bedrock of this siman — the woman's נאמנות ("וספרה לה"), the force and limits of the amatla, the status of the chacham ne'eman, and the gravity of נטמאתי during relations — the Chabad approach does not depart from the framework of the Shulchan Aruch and the Rama. Its distinctiveness shows in the rigor and delicacy with which these intimate questions are handled, and in the systematic referral to the Rav for the real case. We attribute to it no specific provision (duration, count, mode of a teshuvah) that is not attested.

Lema'asse (Daat HaRav). According to the Chabad tradition, in these matters one follows the Tzemach Tzedek and the pisqei dinim transmitted in Chabad. For applying a real case — an amatla, a doubt about ne'emanut, and above all the grave case of נטמאתי and its teshuvah — consult your Rav (or a Chabad Rav / Dayan): this level presents the principle, it does not decide your situation.

4. יסוד הנאמנות — "VeSafrah Lah Le'atzmah"

הָאִשָּׁה שֶׁהִיא בְּחֶזְקַת טְמֵאָה אָסוּר לוֹ לָבֹא עָלֶיהָ עַד שֶׁתֹּאמַר לוֹ טָבַלְתִּי.

— שולחן ערוך יו״ד קפ״ה:א · ופתחי תשובה ס״ק א : אף ששוכבת אצלו צריכה לומר בפירוש

"VeSafrah lah le'atzmah" (Shach s.k. 1). The Shach anchors ne'emanut in the verse: "וספרה לה" — the woman counts for herself. From this he draws a strong practical rule: if the husband does not know whether the days have passed (if he has lost the count), he relies entirely on her. The woman is the keeper of her own count ; this is the whole spirit of Taharat haMishpacha, where trust, not surveillance, governs the home.

Saying "Tavalti" explicitly (PT s.k. 1)

Ne'emanut has a formal condition: the woman בחזקת טמאה remains forbidden until she says "טבלתי." The Pitchei Teshuva (s.k. 1) specifies that even lying beside him, one does not rely on silence or a presumption: she must affirm it explicitly. The positive statement is what changes the chazakah. This is also why the Rama (seif 1) adds that, once the time to count and immerse could have elapsed, stained garments do not contradict her — she may give an amatla ("the butchers' market," "I handled a bird").

Lema'asse (ne'emanut). The rule: the woman's word governs the purity of the home ; the husband relies on her ("וספרה לה לעצמה"), and an explicit declaration ("טבלתי") is needed to lift the presumption of niddah. But the application — a doubt over the count, stained garments, a case where ne'emanut seems in tension — is not decided alone. Consult your Rav (or a Chabad Rav / Dayan / a competent Yoetzet).

5. האמתלא וגבולותיה — A Retracted Statement, Not a Deed

אָמְרָה לְבַעְלָהּ טְמֵאָה אֲנִי וְאַחַר כָּךְ אָמְרָה טְהוֹרָה אֲנִי אֵינָהּ נֶאֱמֶנֶת... וְאִם נָתְנָה אֲמַתְלָא לִדְבָרֶיהָ... נֶאֱמֶנֶת. הגה: וּמִכָּל מָקוֹם מִי שֶׁרוֹצֶה לְהַחְמִיר עַל עַצְמוֹ — מִדַּת חֲסִידוּת הִיא, אֲבָל מִדִּינָא נֶאֱמֶנֶת.

— שולחן ערוך ורמ״א יו״ד קפ״ה:ג

The nature of the amatla. The amatla is an explanation that retracts a first statement by showing why it was said. The woman said "I am tamei," then returns: "I said it not because I was niddah, but because I had not the strength for tashmish" — or for another plausible reason, or out of קטטה (a quarrel), as the Rama specifies. Because it is a dibbur (a statement, not a deed), it can be re-explained: she remains believed. The Rama adds that she is believed even without saying anything afterward, once she comes and lies beside him and he knows the first statement came from a quarrel.

The two limits of the amatla

Not after a deed (Taz s.k. 2). If she was seen wearing the בגדים המיוחדים לימי נדותה, even with an amatla she is not believed: a public deed (ma'aseh) is not retracted like a mere statement. The Taz (in the name of the Rashba's resolution) distinguishes shame / ones (where one understands her silence) from a manifest deed.
Not after 30 days (Beit Shmuel, via PT s.k. 5). The amatla holds only within 30 days ; beyond that, the elapsed time weakens the retraction and she is no longer believed (Beit Shmuel, EH). The PT (s.k. 3) also brings the debate over the amatla bifnei rabbim (Taz vs. Torat haShelamim / Kreti uPleti).

Lema'asse (the amatla). The principle: retracting a statement by explaining why it was said is admissible — but not after a public deed (the niddah garments) nor beyond 30 days. Qualifying an amatla as "plausible," counting the 30 days, the case of a statement made bifnei rabbim, are delicate questions not decided alone. Consult your Rav (or a Chabad Rav / Dayan / a competent Yoetzet).

6. החכם נאמן ועד אחד — Issurin vs. Mamon

The chacham is believed — but he alone (Taz s.k. 3). If the woman says "such a chacham declared this stain pure for me" and the chacham himself denies it ("she lies"), the chacham is believed and she is tamei. The Taz (s.k. 3) sets an essential limit: only the chacham himself is believed to contradict ; a witness reporting what the chacham allegedly said does not suffice (basis: Ketubot 22). This applies a principle of ne'emanut: the one whose original word is the source may correct it.

Issurin vs. mamon (PT s.k. 8). The Pitchei Teshuva (s.k. 8) draws a structuring distinction: the chacham (or the single witness) is believed for the issur (to render the woman tamei or tahor) — a domain where "a single witness is believed for prohibitions" — but not for mamon (monetary matters). Thus his word does not suffice to affect the ketubah (the financial aspect, Even haEzer 116): to deprive the woman of monetary rights one needs the evidentiary regime of mamon (two witnesses). The same word may hold for the prohibition and not hold for the money.

Lema'asse (the chacham ne'eman). The principle: the chacham himself who ruled is believed for the issur (and not a third party reporting him), but his word does not decide the mamon. All this requires identifying who speaks, in what capacity, and to what effect — work of pesak that belongs to the Rav. Consult your Rav (or a Chabad Rav / Dayan).

7. נטמאתי בשעת תשמיש — The Grave Case (with sobriety)

Note on register. This seif touches the most intimate and most grave matter (a risk of karet). We expose it here at the level of principle only, with sobriety and without entering into any concrete case. Any real case — that has occurred or is feared — belongs absolutely and without delay to a Rav (or a Chabad Rav / Dayan).

הָיָה מְשַׁמֵּשׁ עִם הַטְּהוֹרָה וְאָמְרָה לוֹ נִטְמֵאתִי וּפֵרַשׁ מִיָּד — חַיָּב כָּרֵת, שֶׁיְּצִיאָתוֹ הֲנָאָה לוֹ כְּבִיאָתוֹ. כֵּיצַד יַעֲשֶׂה — נוֹעֵץ צִפָּרְנֵי רַגְלָיו בָּאָרֶץ וְשׁוֹהֶה בְּלֹא דִישָׁה עַד שֶׁיָּמוּת הָאֵבֶר, וּפוֹרֵשׁ בְּאֵבֶר מֵת.

— שולחן ערוך יו״ד קפ״ה:ד

"Yetziato hana'ah lo ke'viato" and the withdrawal be'ever met. If, during relations, the woman says "נטמאתי" and the man withdraws at once, he is חייב כרת: for the withdrawal itself is a pleasure like the entry (יציאתו הנאה לו כביאתו). The conduct (keitzad ya'aseh): he presses the toes of his feet into the ground and remains motionless, without any movement, until the ever dies, then withdraws באבר מת — deriving no pleasure from her. The Rama adds that he must be filled with fear and trembling (פחד ורתת) over the transgression that befell him.

Shogeg, ones, and the teshuvah (Rama ; PT s.k. 9-10)

Withdrawal בקשוי בשוגג. If he withdrew בקשוי (in erection) בשוגג — unaware that withdrawing is forbidden — the Rama indicates a teshuvah: 40 days of fasting, not consecutive (two days a week, Monday and Thursday ; on the eve of the fast, no wine or meat), or a redemption through tzedakah (פדיון). The woman needs no atonement.
Ones (PT s.k. 9-10). If relations took place outside the time of the וסת and she finds blood afterward, it is an ones (compelled): neither of them needs atonement. The PT (s.k. 9) brings the Chatam Sofer (the husband is fully ones if she says nothing), and (s.k. 10) the Taz (near the veset in shogeg ; "I sense" is not "she found blood").

Lema'asse (נטמאתי). The gravity of the subject (karet), the conduct (to remain still, ever met), the qualification (shogeg, ones, near or far from the veset) and the eventual teshuvah (fast, pidyon) are never decided alone and in the abstract. If such a case has occurred or is feared, the halacha lema'asse is one: consult your Rav (or a Chabad Rav / Dayan) without delay.

8. פסיקת הספרדים בזמננו — The Contemporary Sephardic Pesak

The contemporary Sephardic pesak (the school of Rav Ovadia Yossef) starts from the Beit Yossef and the Shach. The practical reference is the Taharat haBayit of Rav Ovadia Yossef (and its abridgment Yalkut Yossef — Taharat haBayit, by Rav Yitzchak Yossef), which sets out the foundations of this siman: the woman's ne'emanut ("וספרה לה"), the force and limits of the amatla, the status of the chacham ne'eman, and the gravity of נטמאתי during relations. The spirit of this school tends to rely fully on the woman's ne'emanut and on the chezkat tahara.

9. פסיקת האשכנזים — The Ashkenazi Pesak

Point of the siman	Sephardic orientation (to verify)
Ne'emanut / "Tavalti"	The woman's word governs purity ; the husband relies on her ("וספרה לה לעצמה"). See Taharat haBayit / Yalkut Yossef.
Amatla	Admissible to retract a dibbur, not a ma'aseh (niddah garments) nor beyond 30 days ; application to confirm.
נטמאתי during relations	The gravity, the conduct (ever met) and the teshuvah: a subject to bring to the Rav, never decided alone.

The Ashkenazi pesak starts from the Rama, the Shach and the Taz, then from the great commentary specific to Niddah, the Sidrei Tahara, and the codifiers: the Chochmat Adam (and his Binat Adam) and the Aruch haShulchan (Yoreh De'ah), particularly developed on ne'emanut and the amatla. The Beit Shmuel (on Even haEzer) is the reference on the 30-day limit of the amatla, and the Chatam Sofer on the case of נטמאתי and ones. For the twentieth century, the major practical reference is the Shevet haLevi of Rav Shmuel Wosner (on Hilchot Niddah), often accompanied by the Badei haShulchan (the reference commentary on Hilchot Niddah).

Point of the siman	Ashkenazi orientation (to verify)
Ne'emanut / amatla	Sidrei Tahara, Chochmat Adam and Aruch haShulchan develop the scope of ne'emanut and the amatla (dibbur vs. ma'aseh).
30 days	Beit Shmuel: the amatla holds only within 30 days (via PT s.k. 5).
נטמאתי / ones	Chatam Sofer (PT s.k. 9) ; Taz (PT s.k. 10) ; modes of the fast and pidyon (Shevet haLevi, Badei haShulchan).

Chabad within the pesak

For Chabad practice on this bedrock, one refers to the Tzemach Tzedek (whose Shut covers Hilchot Niddah extensively) and the decisions transmitted in Chabad, with the care proper to the school in these intimate questions. We attribute no specific ruling that is not verifiable ; for the detail, one turns to a Chabad Rav or a Dayan.

10. מקרים מודרניים — Practice Today (with sobriety)

How siman 185 illuminates practice. Four notions of the siman situate the real cases: (1) ne'emanut — the woman's word as bedrock ; (2) amatla — retracting a statement, within its limits ; (3) chacham ne'eman — who is believed, and for what ; (4) נטמאתי — the grave case. All that follows is exposed at the level of principle ; nothing is decided here, and the last point belongs absolutely to the Rav.

Situation	Notion of the siman	Orientation (to confirm with the Rav)
Trust as the bedrock of the home	Ne'emanut	The woman's word governs purity — no surveillance ; "וספרה לה." The husband relies on her ; explicit declaration "טבלתי."
Retracting a statement made out of weakness / a quarrel	Amatla	Admissible for a dibbur, within 30 days, not after a public ma'aseh (niddah garments). The application to the case belongs to the Rav.
A chacham ruled ; who is believed?	Chacham ne'eman	The chacham himself is believed for the issur, not a third party reporting him, and not for mamon (ketubah). The qualification is reserved to the Rav.
נטמאתי during or around relations	נטמאתי / ones	A grave case (karet): the conduct, the qualification (shogeg / ones) and the teshuvah are decided absolutely and without delay with a Rav.

Lema'asse. These situations are intimate and touch a weighty subject (Taharat haMishpacha), and the last the most weighty. They mix questions of fact — the exact content of a statement, the timing relative to the veset, what was seen or said — that only a posek can decide knowing the situation. The practical rule: do not decide alone, and consult your Rav (or a Chabad Rav / Dayan / a competent Yoetzet).

11. סיכום מעשי — Recap and Tables

טבלה — the axes of the siman, in practice

טבלה — who says what (nossei kelim of the siman)

טבלה — Daat HaRav and contemporary streams (to verify)

Notion	In substance	Reference
Ne'emanut	"וספרה לה לעצמה": the woman's word governs purity ; the husband relies on her	Shach s.k. 1 ; PT s.k. 1 ("טבלתי" explicit)
Established as niddah	Seen in niddah garments → certainly tamei (a ma'aseh is not retracted)	Mehaber (seif 2) ; Taz s.k. 2
Amatla	Retract a dibbur with a reason ; not after a ma'aseh nor after 30 days	Rama (seif 3) ; Taz s.k. 2 ; Beit Shmuel (PT s.k. 5)
Chacham ne'eman	The chacham himself believed for the issur, not for mamon	Taz s.k. 3 ; PT s.k. 8 (EH 116)
נטמאתי during relations	Liable to karet ; withdrawal be'ever met ; shogeg → teshuvah ; ones → no atonement	Mehaber and Rama (seif 4) ; PT s.k. 9-10 (Chatam Sofer, Taz)

Posek	Decisive contribution (corpus-anchored)
Mehaber	The principle: a woman בחזקת טמאה forbidden until "טבלתי" ; established as niddah → certainly tamei ; "tamei" then "tahor" not believed unless an amatla ; נטמאתי → karet, withdrawal be'ever met.
Rama (הגה)	Believed despite stained garments once the days have passed (amatla) ; the stringent one = midat chasidut but מדינא believed ; the chacham believed ; fear and trembling ; 40 days of fasting / pidyon ; ones outside the veset.
Shach (Siftei Kohen)	s.k. 1: "וספרה לה לעצמה" — if the husband does not know whether the days have passed, he relies on her.
Taz (Turei Zahav)	s.k. 1 (doubt whether the days have passed → believed) ; s.k. 2 (established as niddah ≥ merely saying: ma'aseh vs. dibbur, the Rashba's resolution) ; s.k. 3 (the chacham himself alone, Ketubot 22).
Pitchei Teshuva	s.k. 1 ("טבלתי" explicit) ; s.k. 3 (amatla bifnei rabbim) ; s.k. 5 (Beit Shmuel: 30 days) ; s.k. 8 (chacham believed for the issur, not for the ketubah) ; s.k. 9-10 (Chatam Sofer ; Taz: near the veset, ones).

Chabad (Daat HaRav): the Tzemach Tzedek (Rabbi Menachem Mendel Schneersohn, 3rd Rebbe of Lubavitch) is the foremost posek of Chabad on Niddah ; his Shut covers Hilchot Niddah. The Chabad school is characterized by care and stringency in these intimate questions. For the detail of a case → Chabad Rav / Dayan. (No specific ruling is attributed here without a source.)

Sefaria links (text and nossei kelim)

👈 הלכה למעשה — the golden rule of this level

On substance, retain the four axes: ne'emanut ("וספרה לה לעצמה," the woman's word as bedrock), amatla (retract a dibbur, within its limits), chacham ne'eman (believed for the issur, not the mamon), נטמאתי (the grave case, to bring to the Rav).
Daat HaRav (Chabad): one follows the Tzemach Tzedek and the pisqei dinim of Chabad, with the school's care in these questions ; the detail is verified with a Chabad Rav / Dayan.
Halacha lema'asse: Beit Yossef, Rama, Shach, Taz, Sidrei Tahara, Chochmat Adam, Aruch haShulchan, Beit Shmuel, Chatam Sofer, and the contemporary pesak (Taharat haBayit, Shevet haLevi, Badei haShulchan) — all on these same axes.
And for any real case — an amatla, a doubt about ne'emanut, and above all the grave case of נטמאתי and its teshuvah — the halacha lema'asse passes through your Rav (or a Chabad Rav / Dayan / a competent Yoetzet).

⚠️ This content is for study purposes, on an intimate and weighty subject (Taharat haMishpacha). The positions cited (Daat HaRav / Chabad, Sephardic and Ashkenazi streams) are landmarks, not a personal psak. For any practical application (לְמַעֲשֶׂה) — and absolutely for the case of נטמאתי — consult a qualified Rav (or a Chabad Rav / Dayan / a Yoetzet).