Numbers 30:12-14

12But if her husband cancels them on the day he hears about it, nothing that came from her lips, whether her vows or her obligation, is binding. Her husband has canceled them, and the Lord will release her.

13Her husband may confirm or cancel any vow or any sworn obligation to deny herself.

14If her husband says nothing at all to her from day to day, he confirms all her vows and obligations, which are binding. He has confirmed them because he said nothing to her when he heard about them.