Numbers 30:2-4  Amplified Bible, Classic Edition

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

³ Also when a woman vows a vow to the Lord and binds herself by a pledge, being in her father’s house in her youth,

⁴ And her father hears her vow and her pledge with which she has bound herself and he offers no objection, then all her vows shall stand and every pledge with which she has bound herself shall stand.