1 Samuel 1:9-11
9 Once when they had finished eating and drinking in Shiloh, Hannah stood up.
Now Eli the priest was sitting on a chair by the doorpost of the Lord’s temple.
10 In bitterness of soul Hannah wept much and prayed to the Lord.
11 And she made a vow, saying, “O Lord Almighty, if you will only
look upon 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.”