Numbers 30:5 (BSB)

But if her father prohibits her on the day he hears about it, then none of the vows or pledges by which she has bound herself shall stand. The LORD will absolve her because her father has prohibited her.

From Numbers 30. Also in the ESV.

Commentary on Numbers 30:5

• John Calvin (Reformed), Calvin's Commentaries on Numbers 30:5: 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.
• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 30:3-16: 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.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 30:5: 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.
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 30:5: But if her father disallow her in the day that he heareth; not any of her vows, or of her bonds wherewith she hath bound her soul, shall stand: and the LORD shall forgive her, because her father disallowed her. (c) By not approving or consenting to her vow.