Siman 100 — A Beriah (Whole Creature) Is Never Nullified
The whole creature, its three conditions, the sinew and its fat, the worms — to discover and understand
יורה דעה · סימן ק׳
בְּרִיָּה אֲפִלּוּ בְּאֶלֶף לֹא בְּטֵלָה
🌱 Introduction Level · מתחילים
✦ ❖ ✦
The beriah — a whole creature/unit (an ant, an impure bird, the gid hanasheh, a limb of a living animal, an egg containing a chick) is never nullified, even in a thousand (אפילו באלף); the three conditions of the beriah (it had life, it was forbidden from its formation, it is whole), the sinew that does not prohibit by taste but whose fat does, and the worms (תולעים) found in vegetables — Shulchan Aruch, Yoreh De'ah 100 — 4 seifim.
Topic: The beriah that is never nullified — its conditions, the sinew and its fat, the worms Source: שולחן ערוך יורה דעה סימן ק׳
Compiled by: הרב יוסף חיים סממה DAAT · daattorah.com
📑 Study outline
1.The text of the Mehaber: the 4 seifim, by thematic groups
2.Context: why the beriah is not nullified — an issue of importance (chashivut)
4.The three conditions: the table of what is and is not a beriah
5.The Shach and the Taz: who they are, a few key entries
6.The gloss of the Rama (הגה)
7.The sinew and its fat: why the sinew does not prohibit but its fat does
8.Modern practical cases: an ant in the flour, an insect in the dish, worms in the salad
9.Summary and comprehension questions
1. The text of the Mehaber — the 4 seifim
Siman 100 deals with a fundamental rule of ביטול (the nullification of prohibited items in a mixture): a beriah — a whole and important creature or unit — is never nullified, even in a thousand (אפילו באלף לא בטלה). The Mehaber (Rabbi Yossef Karo) defines its three conditions, then applies the rule to the case of the גיד הנשה (sciatic nerve) cooked with permitted food (where the sinew itself has no taste, yet its fat prohibits), to a beriah lost in the broth, and to the worms found in vegetables. The Rama (Rabbi Moshe Isserles) adds a gloss on the measure of the sinew. Let us explore the seifim.
Group A — The beriah and its three conditions (seif 1)
Seif 1 — A beriah is never nullified; the three conditions
A beriah (whole creature/unit) — for example an ant (נמלה), an impure bird (עוף טמא), the gid hanasheh (sciatic nerve), a limb of a living animal (אבר מן החי), an egg containing a chick (ביצה שיש בה אפרוח) and the like — is not nullified even in a thousand (אפילו באלף לא בטלה). And a thing only has the status of a beriah if: (1) it is a thing that had life (חיות) — excluding a grain (חטה) of a prohibition; (2) it is forbidden from the beginning of its formation (אסור מתחילת ברייתו) — excluding a kosher bird that became a neveila and a shor ha-niskal (an ox condemned to stoning); (3) it is whole, such that if divided its name no longer applies to it (שאם יחלק אין שמו עליו) — excluding cheilev (forbidden fat), which is still called "cheilev" even divided; and it must actually be whole (שלם). Gloss of the Rama: the essential part of the gid hanasheh is only what is on the kaf (the upper joint of the thigh), about four fingerbreadths wide; if it is whole, it is called a beriah.
The central idea: as a rule, a prohibition is nullified when drowned in a sufficient quantity of permitted food. The beriah is an exception: its importance (chashivut) — being a whole, identifiable unit — means it is never lost in the mass, even one a thousand times its volume. But this exception is strictly hedged by three conditions: one needs a thing that had life, that was forbidden from its formation, and that is whole. Remove any one of the three, and the object becomes nullifiable like any ordinary prohibition.
Group B — The beriah cooked with permitted food; the sinew and its fat (seif 2)
Seif 2 — The cooked beriah; the exception of the gid hanasheh (taste does not prohibit, but its fat does)
A beriah cooked with permitted food: if one does not recognize it → everything is prohibited, and the broth (רוטב) is prohibited by taste (נותן טעם); if one recognizes it → one discards it, and the other pieces and the broth must have sixty against it. The gid hanasheh is an exception: sinews have no taste (אין בגידין בנותן טעם), and the sinew does not prohibit by its taste; but its fat (שמנו) prohibits, and one needs sixty against it to permit the broth. Therefore a thigh (ירך) cooked with its sinew: if one recognizes the sinew → one discards it, and all the rest is permitted if there is sixty against its fat; if one does not recognize it → all the pieces are prohibited, but if there is sixty against the fat in the pot, the broth is permitted (otherwise prohibited). And if the sinew has melted (נמוח) and is no longer recognizable, one also needs sixty against it.
The sinew's dual regime: one must distinguish two things in the gid hanasheh. (1) The sinew itself is a beriah → it is not nullified as a beriah (if whole and recognizable, one removes it); but since "sinews have no taste," it imparts no taste to the dish — so it does not "prohibit" the broth by diffusion. (2) Its fat (shuman), by contrast, gives taste like any fat → it requires sixty against it. And if the sinew has melted (nimoach), it has lost its status as a "whole" beriah, but one still requires sixty.
Group C — A beriah lost in the broth (seif 3)
Seif 3 — A beriah that fell into the broth and was lost
A pot of broth into which a beriah fell and was lost (נאבדה) → everything is prohibited.
Why is everything prohibited? Here the logic of the siman plays out fully. The beriah is not nullified (even in a thousand), and since it has been lost in the broth, one can no longer remove it. As long as it is there — not nullified and impossible to take out — it prohibits the whole. This is the direct application of seif 1: unlike an ordinary prohibition that would have been nullified in the mass, the beriah remains "present" throughout the dish.
Group D — Worms in vegetables (seif 4)
Seif 4 — Three worms (ג׳ תולעים) in cooked vegetables
Vegetables that were cooked and in which three worms (ג׳ תולעים) were found: the vegetables are prohibited, but the cooking water (מי השלקות), one filters it (מסננן) and it is permitted; likewise the meat, one washes it and checks it (ירחצנו ויבדקנו), and it is permitted.
"Three" creates a presumption. Finding three worms (and not two) establishes a chazaka (an established presumption) that this batch of vegetables is infested: one can no longer rely on the rest, and the vegetables are prohibited. But the worms are separable entities: one filters the cooking water (the worms stay in the strainer) and it becomes permitted again, and one washes and checks the meat that cooked with them. The beriah (the worm) is not nullified — but here one can physically remove it, which changes everything.
2. Context — where this siman fits
The whole field of תערובות (mixtures) rests on the principle of bitul: a minority prohibition is nullified in a majority (or in sixty times its volume) of permitted food. Siman 100 states the great exception to this rule: the beriah, by its importance, is never nullified. The question is therefore no longer "how much permitted food is needed?" but "is it really a beriah?" — hence the Mehaber's meticulous attention to the three conditions.
The great questions of the siman
Question
Where?
Typical answer
What is a beriah and its conditions?
Seif 1
Had life + forbidden from its formation + whole → not nullified
The beriah cooked with permitted food
Seif 2
Recognized → discard it + 60; not recognized → all prohibited
The exception of the sinew and its fat
Seif 2
The sinew has no taste; its fat → 60 against it
The beriah lost in the broth
Seif 3
Everything prohibited (not nullified, impossible to remove)
The cross-cutting idea: everything is a matter of importance (chashivut) and of separability. The beriah is not nullified because it counts as a unit. But when one can identify and remove it (discard, filter, check), the rest may become permitted again; when it is lost and untraceable (seif 3), it prohibits everything.
3. The key concepts of this siman
To understand Siman 100, you need to master a small technical vocabulary that describes what "counts" as a unit and why.
בריה — "Whole creature / unit": a forbidden being or object that forms a complete and important unit (an ant, an impure bird, the gid hanasheh, a limb of a living animal, an egg with a chick). By its chashivut, it is never nullified, even in a thousand times its volume (אפילו באלף לא בטלה).
חיות — "Having had life": the first condition of the beriah. The thing must have been alive (an animal, a limb, an egg with a chick). This excludes a grain (חטה) of a prohibition, which never had life — a grain is thus nullified like any prohibition.
אסור מתחילת ברייתו — "Forbidden from the beginning of its formation": the second condition. The object must have been forbidden from the outset. This excludes a kosher bird that became a neveila and a shor ha-niskal (an ox sentenced to stoning), which were not forbidden from their formation.
שלם / שאם יחלק אין שמו עליו — "Whole / whose name disappears if divided": the third condition. The thing must be a unit whose name does not survive division. This excludes cheilev (fat), which is still called "cheilev" even when cut; and it must be actually whole.
אין בגידין בנותן טעם — "Sinews impart no taste": a sinew (gid) is dry and tasteless; it imparts no taste to the dish. The gid hanasheh is therefore a beriah (which one removes if one recognizes it), but it does not prohibit the broth by diffusion — unlike its fat (shuman), which does require sixty.
נמוח — "Melted / dissolved": if the beriah (here the sinew) has melted and is no longer recognizable as a unit, it loses its status as a "whole" beriah. One nonetheless requires sixty against it to permit the mixture.
Two neighboring concepts, not to be confused:ראוי להתכבד ("worthy of being served to guests") and דבר שבמנין ("an item counted by units") are other "important" items that are not nullified — but those belong to Siman 101. The beriah of our siman is a distinct category, founded on the three conditions above.
4. The three conditions — the beriah table
All of seif 1 can be summed up in a table. For each case, one checks whether it satisfies the three conditions — and thus whether it is a beriah that is not nullified.
Object
Condition at stake
Status
Ant, impure bird, sinew, limb of a living animal, egg with a chick
All 3 met
🔴 Beriah → never nullified (אפילו באלף)
A grain (חטה) of a prohibition
Lacks chiyut (life)
🟢 Not a beriah → nullified
Kosher bird that became a neveila; shor ha-niskal
Not forbidden from its formation
🟢 Not a beriah → nullified
Cheilev (fat)
Not whole (the name survives division)
🟢 Not a beriah → nullified
A beriah that has melted (נמוח)
No longer whole
🟡 Loses beriah status, but 60 required
The logic in one sentence: the beriah is not nullified because it is a whole unit, alive at its origin and forbidden from the start. As soon as one of these three conditions is missing — no life (grain), not forbidden originally (kosher bird turned neveila), not a unit (fat, or a melted worm) — the object again becomes nullifiable like any ordinary prohibition.
The Rama's point (seif 1): for the gid hanasheh, the "essential" part of the sinew that counts as a beriah is only the portion on the kaf (the thigh joint), about four fingerbreadths wide. It is this portion, if whole, that carries the beriah status.
5. The Shach and the Taz — the great commentators
In Yoreh De'ah, the Shulchan Aruch is never read on its own. Two great commentaries accompany it on every page and structure the practical study: the Shach and the Taz. These are the standard nos'ei kelim of Yoreh De'ah (no Mishna Berura here, which comments only on Orach Chaim).
The Shach (ש״ך) — an abbreviation of שפתי כהן, Siftei Kohen, by Rabbi Shabtai haCohen (Lithuania, 17th century). It is the standard commentary on Yoreh De'ah, of great analytical depth.
The Taz (ט״ז) — an abbreviation of טורי זהב, Turei Zahav, by Rabbi David haLevi Segal (Poland, 17th century). Often in dialogue — and sometimes in disagreement — with the Shach.
A key entry of the Taz
Taz s.k. 1 — The "not nullified" of the beriah is rabbinic (de-rabbanan)
The Taz explains that the rule "a beriah is not nullified" is de-rabbanan (of rabbinic institution): by Torah law it is nullified like any other prohibition (and one is even liable for less than a kazayit, since "לא תאכל אותם" is written without a measure); it is the Sages who were stringent, because of the importance (chashivut) of the beriah, so that it not be nullified. Practical consequence (nafka mina): in case of doubt (is it really a beriah?), one has a safek de-rabbanan → one is lenient (le-kula) and the object is nullified.
A key entry of the Shach
Shach s.k. 1 — The sinew and the limb are beriot because they had life
The Shach clarifies that the gid hanasheh and the limb of a living animal (אבר מן החי) are indeed beriot (to the point of not being nullified), because they had life (chiyuta) — and this, even though the sinew itself has no taste. The beriah status therefore does not depend on taste, but on the original vitality of the object. So write the Rashba and the Ran.
One sees the method: the Shach and the Taz do not repeat the Mehaber — they ground the mechanism (the beriah is de-rabbanan; the criterion is life, not taste) and derive a practical nafka mina (in doubt, leniency). This is exactly what is studied in depth at the Lamdan level, with the debate on the ant (PT s.k. 1) and the beriah that has melted.
6. The gloss of the Rama (הגה)
The Rama (Rabbi Moshe Isserles) adds to the text of the Mehaber a gloss that clarifies the practice. In our siman, his intervention concerns the measure of the gid hanasheh.
On seif 1 — the measure of the sinew that counts as a beriah
Gloss of the Rama: ועיקר מקום גיד הנשה אינו אלא מה שעל הכף, ורחבו כמו ד׳ אצבעות; ואם הוא שלם — מקרי בריה — "the essential part of the gid hanasheh is only what is on the kaf (the thigh joint), about four fingerbreadths wide; and if it is whole, it is called a beriah". The Rama thereby delimits precisely what, in the sinew, carries the beriah status: not the whole filament, but its central portion on the joint, which must be whole in order not to be nullified.
The Rama's gloss here is a clarification of measure, not a stringency of principle: it states how far the beriah of the sinew extends. As long as this portion (≈ 4 fingerbreadths, on the kaf) is whole, there is a beriah; beyond it, or if it is broken, the status may lapse.
7. The sinew and its fat — why the sinew does not prohibit but its fat does
Seif 2 — the practical heart of the siman — deserves a pause. How can one and the same thigh fall under two regimes at once?
Everything rests on a distinction between the unit (the beriah) and the taste (the noten ta'am):
The sinew itself is a beriah → it is not nullified as a unit. If it is recognizable, one removes it. But it gives no taste (אין בגידין בנותן טעם), so it does not "infect" the broth by diffusion.
Its fat (shuman) gives taste like any fat → it requires sixty against it to permit the broth.
Case (thigh cooked with its sinew)
The sinew
Result
One recognizes the sinew
Discard it
🟢 All permitted if there is 60 against its fat
One does not recognize the sinew — the pieces
Untraceable
🔴 All the pieces prohibited
One does not recognize the sinew — the broth
Untraceable
🟡 Broth permitted if there is 60 against the fat
The sinew has melted (נמוח)
No longer a unit
🟡 One needs 60 against it
The key: for the sinew, it is a question of unit (removing it suffices, since it gives no taste); for its fat, it is a question of taste (one needs 60 to nullify it). This explains why the broth can be permitted (60 against the fat) even while the solid pieces remain prohibited (the untraceable beriah-sinew still lies among them).
8. Modern practical cases
How do these rules apply in our kitchens today? Here are three common situations illuminated by our siman.
Case 1 — An ant (or an insect) that fell into a cooked dish
An ant falls into a large pot of soup. The rule of seif 1 dictates: the ant is a beriah → it is not nullified, even in a thousand. If one finds it, one removes it and the dish can be examined (seif 2, the rule of a recognizable beriah); if it has been lost and cannot be removed, one returns to the case of seif 3 where everything is prohibited. (The Pitchei Teshuva discusses the special case of ants that emerged afterward.) For practical halacha (halacha lema'asse), consult your Rav.
Case 2 — A gid hanasheh left in cooked meat
A gid hanasheh was cooked with a piece of meat (seif 2). The sinew itself has no taste: if one recognizes it, one discards it, and the rest is permitted if there is sixty against its fat. If one cannot find it, the solid pieces are prohibited, but the broth may be permitted with sixty against the fat. This is why nikkur (deveining) is so important before cooking. For practical halacha (halacha lema'asse), consult your Rav.
Case 3 — Worms found in a salad or in cooked vegetables
One discovers worms in cooked vegetables (seif 4). If one finds three, a presumption of infestation (chazaka) is established and the vegetables are prohibited. But the cooking water, once filtered, and the meat that cooked with them, once washed and checked, are permitted — for the worms are separable entities one can remove. (Checking the vegetables also belongs to Siman 84.) For practical halacha (halacha lema'asse), consult your Rav.
The common thread of the three cases: before panicking, ask yourself three questions — is it really a beriah (had life, forbidden from the start, whole)? can one identify and remove it, or has it been lost? is it the object itself (the unit) or its taste (its fat)? But the concrete decision always belongs to the Rav, who knows the details of the case.
9. Summary of Siman 100
The essence of Siman 100 in a few sentences:
A beriah (whole creature/unit) is never nullified, even in a thousand (אפילו באלף לא בטלה) — by its importance (chashivut) (seif 1).
Three conditions: having had life (excludes the grain), forbidden from its formation (excludes the kosher bird turned neveila, the shor ha-niskal), whole (excludes cheilev) (seif 1).
The Rama clarifies: the beriah of the sinew is the portion on the kaf, ≈ 4 fingerbreadths, if it is whole (seif 1).
A beriah cooked with permitted food: recognized → discard it + 60; not recognized → all prohibited, broth noten ta'am (seif 2).
The exception of the sinew: sinews have no taste (the sinew does not prohibit), but its fat prohibits → 60 against it; a melted sinew (נמוח) → 60 (seif 2).
A beriah lost in the broth → everything is prohibited (not nullified, impossible to remove) (seif 3).
Three worms in vegetables → vegetables prohibited, but filtered water and washed/checked meat permitted (seif 4).
What is a בריה? Why is it not nullified, even in a thousand?
List the three conditions of the beriah. Which example does each condition exclude (seif 1)?
Why is a grain (חטה) not a beriah? And a kosher bird that became a neveila?
What does the Rama clarify about the measure of the גיד הנשה (seif 1)?
A beriah cooked with permitted food: what does one do if one recognizes it? if one does not recognize it (seif 2)?
Why does the גיד not prohibit the broth, while its fat does (seif 2)?
What happens if the sinew has melted (נמוח) (seif 2)?
Why does a beriah lost in the broth prohibit everything (seif 3)?
How many worms are needed to prohibit the vegetables? What of the cooking water and the meat (seif 4)?
What does the Taz (s.k. 1) say about the de-rabbanan nature of the beriah? What nafka mina in case of doubt? And the Shach (s.k. 1) on the sinew and the limb?
To go further
If you want to deepen this siman:
📚 Level 2 — Lamdan: the pilpul, the yesod of chashivut (beriah de-rabbanan per the Taz), the debate on the ant that emerged (PT s.k. 1), the limb of a living animal and the kazayit (PT s.k. 2), the melted beriah, anchored in the sugyot
✨ Level 3 — Synthesis: the comparative tables (the 3 conditions, the sinew / its fat), the golden rules, and quick memorization of the 4 seifim
⚖️ Level 4 — Halacha lema'asse: practical ruling (Shach, Taz, Pri Megadim, Pitchei Teshuva) and contemporary poskim on concrete cases
The sources for this level can be consulted on Sefaria: