וְשָׁמַ֥ע אִישָׁ֛הּ בְּי֥וֹם שָׁמְע֖וֹ וְהֶחֱרִ֣ישׁ לָ֑הּ וְקָ֣מוּ נְדָרֶ֗יהָ וֶֽאֱסָרֶ֛הָ אֲשֶׁר־אָסְרָ֥ה עַל־נַפְשָׁ֖הּ יָקֻֽמוּ׃
and her husband hear it, whatsoever day it be that he heareth it, and hold his peace at her; then her vows shall stand, and her bonds wherewith she hath bound her soul shall stand.
Read kabbalistic (mystical) interpretation of Numbers 30:8: and classical mystical sources.