1 Samuel 1:3, 11

Year after year this man went up from his town to worship and sacrifice to the LORD Almighty at Shiloh, where Hophni and Phinehas, the two sons of Eli, were priests of the LORD.

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.”