Numbers 30:14
If he says nothing to her about it day after day, this means he decided that she must keep her vow or oath. She must keep it because he said nothing to her when he heard about it.
Treasury of Scripture Knowledge
Summary
But if her husband altogether hold his peace at her from day to day; then he establisheth all her vows, or all her bonds, which are upon her: he confirmeth them, because he held his peace at her in the day that he heard them.
General references
Bible References
General references
Numbers 30:7
she must do everything that she vowed or promised unless her husband raises an objection when he hears about it.