1 Samuel 1:10-11

10And she was in bitterness of soul, and prayed unto Yhwh, and wept sore.1

11And she vowed a vow, and said, O Yhwh of Armies, if thou wilt indeed look on the affliction of thine handmaid, and remember me, and not forget thine handmaid, but wilt give unto thine handmaid a man child, then I will give him unto Yhwh all the days of his life, and there shall no razor come upon his head.2