Numbers 30:2-4

New Revised Standard Version, Anglicised Catholic Edition

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.