Vows are not to be broken.
Numbers 30:1 And he said to the princes of the tribes of the children of Israel: This is the word that the Lord hath commanded: Numbers 30:2 If any man make a vow to the Lord, or bind himself by an oath: he shall not make his word void but shall fulfil all that he promised.
The exception of a maid's vow,
Numbers 30:3 If a woman vow any thing, and bind herself by an oath, being in her father's house, and but yet a girl in age: if her father knew the vow that she hath promised, and the oath wherewith she hath bound her soul, and held his peace, she shall be bound by the vow: Numbers 30:4 Whatsoever she promised and swore, she shall fulfil in deed. Numbers 30:5 But if her father, immediately as soon as he heard it, gainsaid it, both her vows and her oaths shall be void, neither shall she be bound to what she promised, because her father hath gainsaid it.
of a wife's,
Numbers 30:6 If she have a husband, and shall vow any thing, and the word once going out of her mouth shall bind her soul by an oath, Numbers 30:7 The day that her husband shall hear it, and not gainsay it, she shall be bound to the vow, and shall give whatsoever she promised. Numbers 30:8 But if as soon as he heareth he gainsay it, and make her promises and the words wherewith she had bound her soul of no effect: the Lord will forgive her.
of a widow's, or her that is divorced.
Numbers 30:9 The widow, and she that is divorced, shall fulfil whatsoever they vow. Numbers 30:10 If the wife in the house of her husband, hath bound herself by vow and by oath, Numbers 30:11 If her husband hear, and hold his peace, and doth not disallow the promise, she shall accomplish whatsoever she had promised. Numbers 30:12 But if forthwith he gainsay it, she shall not be bound by the promise: because her husband gainsaid it, and the Lord will be merciful to her. Numbers 30:13 If she vow and bind herself by oath, to afflict her soul by fasting, or abstinence from other things, it shall depend on the will of her husband, whether she shall do it, or not do it. Numbers 30:14 But if the husband hearing it hold his peace, and defer the declaring his mind till another day: whatsoever she had vowed and promised, she shall fulfil: because immediately as he heard it, he held his peace. Numbers 30:15 But if he gainsay it after that he knew it, he shall bear her iniquity. Numbers 30:16 These are the laws which the Lord appointed to Moses between the husband and the wife, between the father and the daughter that is as yet but a girl in age, or that abideth in her father's house.