Numbers 30:4

And her father hear her vow, and her bond wherewith she hath
bound her soul
Her vow, which is binding upon her, or her vow and an oath annexed to it; which makes it still more strongly binding; and this he hears himself, or it is reported to him by others: and her father shall hold his peace at her; shall not reprove her for it, nor contradict her in it: then all her vows shall stand; be they what, or as many as they may:

and every bond wherewith she hath bound her soul shall stand;
his silence being to be interpreted as approving of them, and consenting to them.