1 Samuel 1:10

8Elkanah her husband said to her, “Hannah, why do you weep? Why don’t you eat? Why is your heart grieved? Am I not better to you than ten sons?”

9So Hannah rose up after they had finished eating and drinking in Shiloh. Now Eli the priest was sitting on his seat by the doorpost of the LORD’s temple.

10She was in bitterness of soul, and prayed to the LORD, weeping bitterly.

11She vowed a vow, and said, “LORD of Armies, if you will indeed look at the affliction of your servant and remember me, and not forget your servant, but will give to your servant a boy, then I will give him to the LORD all the days of his life, and no razor shall come on his head.”

12As she continued praying before the LORD, Eli saw her mouth.