1 Samuel 1:10-12

10 In her bitterness she prayed to the Lord, weeping freely,

11 and made this vow: "O Lord of hosts, if you look with pity on the hardship of your servant, if you remember me and do not forget me, if you give your handmaid a male child, I will give him to the Lord all the days of his life. No razor shall ever touch his head." [3] [AF]

12 As she continued praying before the Lord, Eli watched her mouth,