Matthew Poole and continuators on Numbers 30:4

4 And her father hear her vow, and her bond, wherewith she hath bound her soul, and her father shall hold his peace at her : then all her vows shall stand, and every bond, wherewith she hath bound her soul, shall stand :

Under which Title seem to be comprehended, as in other places of Scripture, Masters, Magistrates, and all other superiours, in such cases wherein their right is given away by the inferiour vow, as for instance, when a Servant vows to go a long journey for his Friend, and his Master will not permit him to do so, but not in other cases; as if a Servant vows to do something for another in that time which his Master alloweth to his own use and disposal, in this case his vow binds him, but not in the former.

His silence being an interpretative consent, and much more if he declares his approbation of it.

i. e. Be established, or confirmed, or be in force.