When one man's word is enough to forbid what belongs to another: wine still בידו, a word spoken at the first meeting, silence taken as admission and the condition on it, the אמתלא that reopens it, the Rama's איני מאמינך and where it stops, מיגו במקום עדים, the worker who forfeits his wage, the rule עד אחד נאמן באיסורים, and the minor as a keeper (Shulchan Aruch, Yoreh De'ah 127 — 4 seifim)
האומר לחבירו נתנסך יינך אם הוא בידו נאמן
One who tells his fellow: your wine was made yayin nesekh — if the wine is in his hands, he is believed. One man, one sentence, and somebody else's barrel is lost.
Shulchan Aruch, Yoreh De'ah 127:1LEVEL 01
The Hebrew text of all 4 seifim with a fluent English translation. Who is believed, when he must have spoken, what the owner's silence is worth, the worker who forfeits his wage and the rule of the single witness — explained step by step with concrete examples.
📖 StudyLEVEL 02
In-depth pilpul: the definition of בידו — migo or the standing of a keeper, the nature of שתיקה כהודאה between admission and presumption, the Shach's question on a single man's denial, מיגו במקום עדים and שוייה אנפשיה, and the exact reach of עד אחד נאמן באיסורים.
📖 StudyLEVEL 03
Two master grids (the three standings of the speaker, the three answers of the owner), the four breaches of seif 3, golden rules, the mnemonic « בידו », classic pitfalls and a line-by-line recap of all 4 seifim.
📖 StudyLEVEL 04
The practical halacha according to the ש״ך, the ט״ז and the פתחי תשובה, and then the poskim. Note: the Admur HaZaken wrote no Shulchan Aruch on Yoreh De'ah — this is a level of psak, not “Daat HaRav”.
📖 StudyYes, but on measured conditions. The Mehaber opens the siman with it: « האומר לחבירו נתנסך יינך אם הוא בידו נאמן » (שו״ע יו״ד קכ״ז:א). Three standings are possible. The wine is still in his hands — he is its keeper — and he is believed with no more. He gave it back, but spoke the first time he saw the owner again: he is believed, even against a denial. He gave it back and spoke only later: he is believed no longer, once the owner denies or says “I do not know”. For halacha le-ma'aseh, ask your Rav.
The Mehaber concludes that it does — שתיקה כהודאה דמיא — but he attaches a condition at once: « והוא שיאמר לו נתנסך יינך בפניך או שאמר ליה ידעת דרגלים לדבר » (שו״ע יו״ד קכ״ז:א). Without one of those two phrases, the owner may have kept quiet simply because he knows nothing. The Shach adds that this silence is no admission in the strict sense: « לאו כהודאה ממש … אלא כיון ששותק נראה שיודע רגלים לדבר וסומך על העד » (ש״ך יו״ד קכ״ז ס״ק י). And if he kept silent and then explains himself — he was weighing it in order to remember — he is believed. For halacha le-ma'aseh, ask your Rav.
The Rama makes it a practice: « ומלמדי׳ אותו לכתחלה שיאמר איני מאמינך ואז לכ״ע שרי דבעלים נאמנים על שלהם » (רמ״א יו״ד קכ״ז:א). The Shach stresses that one prepares him in advance, so that he answers without delay, and that one does not teach him to deny the facts — « דהיאך ילמדוהו לשקר » (ש״ך יו״ד קכ״ז ס״ק י״א). But the device has a boundary that the Rama himself draws: « ודוקא ביין נסך שאין לדקדק בו כל כך אבל בשאר איסורים לא מהני אם אמר איני מאמינך אם מאמין בלבו » (רמ״א יו״ד קכ״ז:א). The Taz supplies the reason. For halacha le-ma'aseh, ask your Rav.
Because his word turns against him. Seif 2 lays down that all the conditions of seif 1 hold only where speaking costs nothing: « במה דברים אמורים כשעושה עמו בחנם או אפי׳ בשכר והוא בענין שלא יפסיד שכירותו » (שו״ע יו״ד קכ״ז:ב). But if he was hired dearly and ascribes the mishap to his own negligence, he forfeits his whole wage by speaking — and he is then believed even though the wine is no longer in his hands. The principle comes from the gemara: « מתוך שאתה נאמן להפסיד שכרך אתה נאמן להפסיד ספר תורה » (גיטין נ״ד ע״ב). The Rama nonetheless requires the loss to be plain to everybody. For halacha le-ma'aseh, ask your Rav.
Seif 3 states it in six words: « עד אחד נאמן באיסורים להתיר אבל לא להחמיר » (שו״ע יו״ד קכ״ז:ג). The Rama opens four breaches in it: a matter that can be checked, where one must go and look; a matter where nothing is established, where the witness is believed even to forbid — « וכל דבר שלא אתחזק לא להיתר ולא לאיסור עד אחד נאמן עליו אפילו לאסרו » (רמ״א יו״ד קכ״ז:ג); a matter where the prohibition is established, where he is believed to permit only if he can put it right; and property of his own — « ואדם נאמן על שלו אפי׳ היכא דאתחזק איסורא » (רמ״א יו״ד קכ״ז:ג). Seif 4 adds that a minor who has reached דעת שמירה suffices as a keeper where there is no חזקת איסור. For halacha le-ma'aseh, ask your Rav.