2 A man who makes a vow to the Lord or makes a pledge under oath must never break it. He must do exactly what he said he would do.
3 "If a young woman makes a vow to the Lord or a pledge under oath while she is still living at her father's home, 4 and her father hears of the vow or pledge and does not object to it, then all her vows and pledges will stand. 5 But if her father refuses to let her fulfill the vow or pledge on the day he hears of it, then all her vows and pledges will become invalid. The Lord will forgive her because her father would not let her fulfill them. 6 "Now suppose a young woman makes a vow or binds herself with an impulsive pledge and later marries. 7 If her husband learns of her vow or pledge and does not object on the day he hears of it, her vows and pledges will stand. 8 But if her husband refuses to accept her vow or impulsive pledge on the day he hears of it, he nullifies her commitments, and the Lord will forgive her. 9 If, however, a woman is a widow or is divorced, she must fulfill all her vows and pledges. 10 "But suppose a woman is married and living in her husband's home when she makes a vow or binds herself with a pledge. 11 If her husband hears of it and does not object to it, her vow or pledge will stand. 12 But if her husband refuses to accept it on the day he hears of it, her vow or pledge will be nullified, and the Lord will forgive her. 13 So her husband may either confirm or nullify any vows or pledges she makes to deny herself.
Matthew Henry's Commentary on Numbers 30:2-13
Commentary on Numbers 30:1-2
(Read Numbers 30:1-2)
No man can be bound by his own promise to do what he is already, by the Divine precept, forbidden to do. In other matters the command is, that he shall not break his words, through he may change his mind.
Commentary on Numbers 30:3-16
(Read Numbers 30:3-16)
Two cases of vows are determined. The case of a daughter in her father's house. When her vow comes to his knowledge, it is in his power either to confirm it or do it away. The law is plain in the case of a wife. If her husband allows her vow, though only by silence, it stands. If he disallows it, her obligation to her husband takes place of it; for to him she ought to be in subjection, as unto the Lord. The Divine law consults the good order of families. It is fit that every man should bear rule in his own house, and have his wife and children in subjection; rather than that this great rule should be broken, or any encouragement be given to inferior relations to break those bonds asunder, God releases the obligation even of a solemn vow. So much does religion secure the welfare of all societies; and in it the families of the earth have a blessing.