If a man vows a vow to the Lord, or swears an oath to bind himself with a bond, he will not break his word. He will do according to all that proceeds out of his mouth.
and her father hears her vow and her bond with which she has bound herself, and her father is silent to her, then all her vows will stand, and every bond with which she has bound herself will stand.
Now the Israelites did not attack them, for the leaders of the congregation had sworn an oath to them by the Lord, the God of Israel, so the congregation murmured against the leaders.
When he saw her, he ripped up his clothes and said, “Alas, my daughter! You have brought utter disaster to me. You are my undoing, for I have given my word to the Lord, and I cannot take it back.”
So she made a vow and said, “O Lord of Hosts, if You will indeed look on the affliction of Your maidservant, and remember me and not forget Your maidservant, but will give to Your maidservant a baby boy, then I will give him to the Lord all the days of his life, and no razor shall touch his head.”
He also rebelled against King Nebuchadnezzar, who had made him swear by an oath by God. He stiffened his neck and hardened his heart against turning to the Lord God of Israel.