2 When a man makes a vow to the Lord, or swears an oath to bind himself by a pledge, he shall not break his word; he shall do according to all that proceeds out of his mouth.
3 When a woman makes a vow to the Lord, or binds herself by a pledge, while within her father's house, in her youth, 4 and her father hears of her vow or her pledge by which she has bound herself, and says nothing to her; then all her vows shall stand, and any pledge by which she has bound herself shall stand. 5 But if her father expresses disapproval to her at the time that he hears of it, no vow of hers, and no pledge by which she has bound herself, shall stand; and the Lord will forgive her, because her father had expressed to her his disapproval. 6 If she marries, while obligated by her vows or any thoughtless utterance of her lips by which she has bound herself, 7 and her husband hears of it and says nothing to her at the time that he hears, then her vows shall stand, and her pledges by which she has bound herself shall stand. 8 But if, at the time that her husband hears of it, he expresses disapproval to her, then he shall nullify the vow by which she was obligated, or the thoughtless utterance of her lips, by which she bound herself; and the Lord will forgive her. 9 (But every vow of a widow or of a divorced woman, by which she has bound herself, shall be binding upon her.) 10 And if she made a vow in her husband's house, or bound herself by a pledge with an oath, 11 and her husband heard it and said nothing to her, and did not express disapproval to her, then all her vows shall stand, and any pledge by which she bound herself shall stand. 12 But if her husband nullifies them at the time that he hears them, then whatever proceeds out of her lips concerning her vows, or concerning her pledge of herself, shall not stand. Her husband has nullified them, and the Lord will forgive her. 13 Any vow or any binding oath to deny herself, her husband may allow to stand, or her husband may nullify.
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.