Mishnayos Nedarim Perek 11 Mishnah 9

The Torah states: “But every vow of a widow, and of her that is divorced, with which she has bound her soul, shall stand against her” (Numbers 30:10). How so? If a widow or divorced woman said: I am hereby a nazirite after thirty days, then even if she was married within thirty days, her new husband cannot nullify her vow. If she took a vow while she was under the jurisdiction of her husband, he can nullify the vow for her. How so? If she said when she was still married: I am hereby a nazirite for after thirty days, and her husband nullified the vow, then even if she was widowed or divorced within the thirty-day period, the vow is nullified. If she took a vow on that, i.e., one, day and was divorced on that same day, then even if her husband took her back as his wife on that same day, he cannot nullify her previous vows. This is the principle: Once she has left and gone into her own jurisdiction for even a single hour, then after they are remarried her husband can no longer nullify any vow she uttered during their first marriage.

וְנֵדֶר אַלְמָנָה וּגְרוּשָׁה יָקוּם עָלֶיהָ (במדבר ל). כֵּיצַד. אָמְרָה, הֲרֵינִי נְזִירָה לְאַחַר שְׁלשִׁים יוֹם, אַף עַל פִּי שֶׁנִּשֵּׂאת בְּתוֹךְ שְׁלשִׁים יוֹם, אֵינוֹ יָכוֹל לְהָפֵר. נָדְרָה וְהִיא בִרְשׁוּת הַבַּעַל, מֵפֵר לָהּ. כֵּיצַד. אָמְרָה, הֲרֵינִי נְזִירָה לְאַחַר שְׁלשִׁים, אַף עַל פִּי שֶׁנִּתְאַלְמְנָה אוֹ נִתְגָּרְשָׁה בְתוֹךְ שְׁלשִׁים, הֲרֵי זֶה מוּפָר. נָדְרָה בוֹ בַיּוֹם, נִתְגָּרְשָׁה בוֹ בַיּוֹם, הֶחֱזִירָהּ בּוֹ בַיּוֹם, אֵינוֹ יָכוֹל לְהָפֵר. זֶה הַכְּלָל, כֹּל שֶׁיָּצָאת לִרְשׁוּת עַצְמָהּ שָׁעָה אַחַת, אֵינוֹ יָכוֹל לְהָפֵר: