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Why can a husband annul his wife's vow of nazirus when nazirus has a Torah (תורה)-imposed minimum of 30 days? The Gemara (גמרא)'s principle that "neder ein lo kitzvah" (a vow has no fixed limit) enables hafara, but nazirus *does* have a limit. The shiur explores whether hafara is a veto power or itself an act of koach hadibur that negates the woman's words, and how the Rambam (רמב"ם) reads the hekesh uniquely.
The shiur analyzes Nedarim 4b, focusing on a Gemara (גמרא) that extends the husband's or father's power of hafara (annulment) from nedarim to nazirus through a hekesh (juxtaposition). The opening question is immediate and sharp: if the halacha (הלכה) of hafara is derived from nedarim, where a vow has "ein lo kitzvah" (no fixed limit set by the Torah (תורה)), how can hafara apply to nazirus, which by Torah law is "yeish lo kitzvah" (has a fixed 30-day minimum)? Even if a woman declares nazirus for one day, the Torah imposes a 30-day term. This seems to undercut the whole basis for hafara, which rests on the premise that the woman herself controls the scope of the prohibition. Rabbi Zweig presents the approaches of the Rishonim. Tosafos (תוספות) and the Ran appear to understand that the Gemara's answer—"min hadar"—means that nazirus, despite its Torah minimum, is still rooted in the woman's dibur (speech) and therefore subject to hafara. The Ran suggests that the very fact that one *can* accept nazirus for a day (even though the Torah extends it to 30) shows it retains the character of a neder. The Rosh adds that since stam neder is forever and kovei'a zman makes it limited, the Torah gave hafara power specifically where the scope is in the speaker's control. But the difficulty remains: once we admit that nazirus has a Torah-imposed extension beyond the woman's words, why should her husband's words override it?
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Nedarim 4b
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