כל אשר אסרה על נפשה יקום עליה. לְפִי שֶׁאֵינָהּ לֹא בִרְשׁוּת אָב וְלֹא בִרְשׁוּת בַּעַל, וּבְאַלְמָנָה מִן הַנִּשּׂוּאִין הַכָּתוּב מְדַבֵּר, אֲבָל אַלְמָנָה מִן הָאֵרוּסִין — מֵת הַבַּעַל נִתְרוֹקְנָה וְחָזְרָה רְשׁוּת לָאָב (נדרים ע'): כל אשר אסרה על נפשה יקום עליה [BUT THE VOW OF A WIDOW AND OF ONE WHO IS DIVORCED] EVERYTHING WHEREWITH SHE HATH BOUND HER SOUL SHALL STAND AGAINST HER — because she is not under the control of a father or under the control of a husband. Scripture is speaking of one who is a widow after having been fully married (נשואה) (Sifrei Bamidbar 154:1), but in the case of one who becomes a widow after having only been betrothed, if her husband dies his entire authority becomes emptied (void) and returns to her father (Nedarim 70a).