Numbers 30:2-5

30:2 If a man makes a vow to the Lord or takes an oath of binding obligation on himself, he must not break his word, but must do whatever he has promised.

Vows Made by Single Women

30:3 “If a young woman who is still living in her father’s house makes a vow to the Lord or places herself under an obligation, 30:4 and her father hears of her vow or the obligation to which she has pledged herself, and her father remains silent about her, then all her vows will stand, and every obligation to which she has pledged herself will stand. 30:5 But if her father overrules her when he hears about it, then none of her vows or her obligations which she has pledged for herself will stand. And the Lord will release her from it, because her father overruled her.