Nedarim 70

Sugya Map

• Issue: Can a husband nullify his wife's vow with a delayed effect (e.g., "nullified for you tomorrow" or "after an hour")?
• Nafka Mina: Does such a declaration constitute a de facto ratification for the immediate period, rendering the later nullification ineffective? Or is it an immediate nullification that begins later? Or is it simply invalid?
• Primary Sources: Numbers 30:8 ("ביום שמעו" – on the day he hears it), Nedarim 70a, Mishna Nazir 20b.

Text Snapshot

The Gemara posits: "אם תאמר... מופר ליכי למחר מהו? מי אמרינן למחר לא מצי מיפר דהא קיימיה לנדריה היום... או דלמא כיון דלא אמר לה קיים ליכי היום, כי קאמר לה מופר ליכי למחר מהיום קאמר?"^Nedarim 70a. Dikduk/Leshon: The iterative "מי אמרינן... או דלמא" structure signals a deep conceptual safek within the Gemara itself, grappling with the nature of hafara and the implications of intent. The phrase "מהיום קאמר" is critical, suggesting a retroactive effect if the latter option is chosen.

Readings

• Rashi: Explains the first side of the safek: by stating "מופר ליכי למחר," the husband implicitly confirms the vow's validity for "היום," thereby ratifying it and losing the power to nullify.^Rashi, Nedarim 70a s.v. אמר לה מופר ליכי למחר מהו.
• Reshimot Shiurim: Proposes that hafara, much like yi'ush (despair), cannot be delayed; it must take effect miyad. Thus, if one attempts to declare it for a later time, it either takes effect immediately or is altogether invalid.^Reshimot Shiurim, Nedarim 70a s.v. כי קאמר לה מופר ליכי למחר מהיום קאמר.

Friction

The Gemara attempts to resolve the safek from Mishna Nazir 20b: If a husband says "ואני" (I too [am a Nazirite]), he cannot nullify his wife's vow. The kushya is: why, if "ואני" only indicates his personal vow, can he not nullify it later that day? The terutz: "ואני" is like saying "קיים ליכי לעולם" (it is ratified for you forever).^Nedarim 70a. This terutz is significant because it fails to resolve our original safek, as it posits a unique, immediate ratification, leaving the general case of delayed hafara unresolved.

Intertext

The principle of an act requiring immediate effect or being bound by a specific temporal window ("ביום שמעו") echoes in other areas. For instance, terumah requires intention at the moment of separation, not for a future point.^Terumot 1:1. Similarly, geirushin (divorce) must be absolute and immediate, not conditional on future events or delayed.^Gittin 75a.

Psak/Practice

The Rif rules stringently on this unresolved safek: "ובעיין לא איפשיטא ואזלינן לחומרא."^Rif, Nedarim 23b:5. Consequently, an attempt to nullify a vow with a delayed effect is invalid, meaning the vow remains in force.

Takeaway

The Gemara's unresolved safek and the Rif's chumra underscore the critical, time-sensitive nature of hafara. Any attempt to defer its effect is met with skepticism, ultimately rendering it invalid.