Study of Hannah and her heartfelt prayer to God.
And she made a vow, saying, “Lord Almighty, if you will only look on your servant’s misery and remember me, and not forget your servant but give her a son, then I will give him to the Lord for all the days of his life, and no razor will ever be used on his head...Eli answered, “Go in peace, and may the God of Israel grant you what you have asked of him... I prayed for this child, and the Lord has granted me what I asked of him. 28 So now I give him to the Lord. For his whole life he will be given over to the Lord. And he worshiped the Lord there."
(1 Samuel 1:11,17,27-28)