But if her father opposes her on the day that he hears of it, no vow of hers, no pledge by which she has bound herself shall stand. And the LORD will forgive her, because her father opposed her.
5. But if her father disallow her. The expression is remarkable, “And the Lord shall forgive her,” whereby Moses gently reproves the foolish thoughtlessness of the girl; and soon afterwards the same thing is spoken of married women. And surely their rashness is worthy of reprehension, if unmindful of their condition, they, as it were, shake off the yoke and hastily commit themselves.
It is here taken for granted that all such persons as are sui juris - at their own disposal, and are likewise of sound understanding and memory, are bound to perform whatever they vow that is lawful and possible; but, if the person vowing be under the dominion and at the disposal of another, the case is different. Two cases much alike are here put and determined: - I.
Commenting on Numbers 30:3-16
But if her father disallow her in the day that he heareth,.... Disapproves of her vow, and expresses his dislike of it, and declares it null and void; which, if done at all, is to be done on the same day he hears it, and not on another day, as Aben Ezra observes; not the day following, and much less on a third or fourth day, &c.