1 Samuel 1:8-12

Then Elkanah her husband would say to her, “Hannah, why do you weep, and why do you not eat, and why is your heart sad? Am I not better to you than ten sons?”

Then Hannah got up after eating and drinking in Shiloh. Now Eli the priest was sitting on the seat by the doorpost of the temple of the Lord.

She, greatly distressed, prayed to the Lord and wept bitterly.

And she made a vow and said, “Lord of armies, if You will indeed look on the affliction of Your bond-servant and remember me, and not forget Your bond-servant, but will give Your bond-servant a son, then I will give him to the Lord all the days of his life, and a razor shall never come on his head.”

Now it came about, as she continued praying before the Lord, that Eli was watching her mouth.