Nedarim 68bChapter 10 Na'arah HaMeorasah

אֲבָל אִם שָׁמַע וְקִיֵּים, אוֹ שֶׁשָּׁמַע וְשָׁתַק וּמֵת בַּיּוֹם שֶׁלְּאַחֲרָיו — אֵין יָכוֹל לְהָפֵר.

But if it is a case where the husband of a betrothed young woman heard and ratified the vow, or where he heard, and was silent, and died on the following day, in which case his silence is considered ratification of the vow, then the father cannot nullify the vow.

שָׁמַע אָבִיהָ וְהֵפֵר לָהּ, וְלֹא הִסְפִּיק בַּעַל לִשְׁמוֹעַ עַד שֶׁמֵּת הָאָב — זוֹ הִיא שֶׁשָּׁנִינוּ: מֵת הָאָב, לֹא נִתְרוֹקְנָה רְשׁוּת לַבַּעַל. שָׁמַע בַּעְלָהּ וְהֵפֵר לָהּ, וְלֹא הִסְפִּיק הָאָב לִשְׁמוֹעַ עַד שֶׁמֵּת הַבַּעַל — זוֹ הִיא שֶׁשָּׁנִינוּ: מֵת הַבַּעַל, נִתְרוֹקְנָה רְשׁוּת לָאָב.

If her father heard or was made aware of the vow and nullified it for her but the husband did not manage to hear of the vow before the father died, this is what we learned in the same mishna (70a): If the father dies, the authority over her vows does not revert to the husband, i.e., a young woman’s betrothed cannot nullify her vows alone, without the father. If her husband heard the vow and nullified it for her, and the father did not manage to hear of the vow before the husband died, this is what we learned in the mishna: If the husband dies, the authority reverts to the father.

שָׁמַע בַּעְלָהּ וְהֵפֵר לָהּ, וְלֹא הִסְפִּיק הָאָב לִשְׁמוֹעַ עַד שֶׁמֵּת — אֵין הַבַּעַל יָכוֹל לְהָפֵר, שֶׁאֵין הַבַּעַל מֵיפֵר אֶלָּא בְּשׁוּתָּפוּת.

If her husband heard and nullified the vow for her, and the father did not manage to hear of the vow before he died, the husband cannot nullify it, although she no longer has a father, as the husband can nullify vows only in partnership with the father.