Numbers 30:2-4

2If a man makes a vow to the Lord, or swears an oath to bind himself by some agreement, he shall not break his word; he shall do according to all that proceeds out of his mouth.

3“Or if a woman makes a vow to the Lord, and binds herself by some agreement while in her father’s house in her youth,

4and her father hears her vow and the agreement by which she has bound herself, and her father holds his peace, then all her vows shall stand, and every agreement with which she has bound herself shall stand.