Nedarim 66

This sugya from Nedarim 66 delves into the nuanced conditions for dissolving a vow (hatarat nedarim) when it's based on a mistaken premise (neder b'ta'ut). The Gemara's precise textual analysis clarifies the Mishna's seemingly stringent language regarding what constitutes a valid petach (opening for dissolution).

Sugya Map

Issue

The Mishna discusses petach (dissolution) for vows based on a mistaken premise. The core issue: must the subject be actively good or merely not bad to invalidate the vow's rationale? This defines the scope of neder b'ta'ut.

Nafka Mina

Determining the breadth of hatarat nedarim for vows based on factual error; does the petach require active benefit or merely the absence of harm?

Primary Sources

Mishna Nedarim 66a; Gemara Nedarim 66a; Rashi Nedarim 66a s.v. v'tifeik li d'ein ra; Steinsaltz Nedarim 66a s.v. v'od yafeh katani.

Text Snapshot

MISHNA: "קונם יין שאני טועם שהיין רע למעיים... אמרו לו והלא המיושן יפה למעיים הותר." (Nedarim 66a) GEMARA: "ותיפוק ליה דאין רע? אמר ר' אבא ועוד יפה קתני." (Nedarim 66a)

Dikduk/Leshon Nuance

The Mishna states the vow is dissolved because "aged wine is good (יפה) for the intestines." The Gemara questions this, asking why "not bad" (אין רע) wouldn't suffice for dissolution. R' Abba responds that "good" is an additive phrase (ועוד יפה קתני), implying "not bad" is the fundamental petach.

Readings

Rashi

Rashi highlights the Gemara's kushya: if the vow was based on "bad" (רע), why require "good" (יפה) for dissolution? Proving it's not bad (אין רע) should already establish neder b'ta'ut.^[Rashi Nedarim 66a s.v. ותיפוק לי דאין רע]

Steinsaltz

Steinsaltz clarifies R' Abba's resolution: "good" is אלא תוספת (merely an addition). The petach is fundamentally established by negating the "bad."^[Steinsaltz Nedarim 66a s.v. ועוד יפה קתני]

Friction

Kushya

The Mishna's phrasing suggests active benefit (יפה) is required for petach, setting a higher bar than merely disproving the original negative premise (רע) with אין רע.

Terutz

R' Abba explains ועוד יפה קתני: the Mishna makes two points: it's not bad (sufficient for petach), and furthermore, it's good. "Good" is an amplification, not a prerequisite.

Intertext

The principle of neder b'ta'ut (vow made in error) aligns with mekach ta'ut (mistaken transaction). An agreement based on a fundamental factual misunderstanding is nullified.^[See e.g., Bava Metzia 49b regarding mekach ta'ut]

Psak/Practice

This sugya demonstrates a broad approach to hatarat nedarim based on factual error. Disproving the original premise, even without proving its active opposite, can dissolve a vow. Chachamim generally seek to remove obstacles, favoring broad interpretations of petach.

Takeaway

The Gemara's precise analysis reveals that hatarat nedarim for factual error requires only the falsification of the vow's underlying premise, not necessarily its complete opposite.