1 Samuel 1:9-11

9After eating and drinking in Shiloh, Hannah got up. Now Eli the kohen was sitting on his seat by the doorpost of the Temple of Adonai.

10While her soul was bitter, she prayed to Adonai and wept.

11So she made a vow and said, “Adonai-Tzva’ot, if You will indeed look upon the affliction of Your handmaid, remember me and not forget Your handmaid, but grant Your handmaid a son, then I will give him to Adonai all the days of his life and no razor will ever touch his head.”