1 Samuel 1:9-11

So Hannah got up after eating and drinking in Shiloh. Now Eli the priest was sitting on his seat beside the doorpost of the temple (tabernacle) of the LORD. Hannah was greatly distressed, and she prayed to the LORD and wept in anguish. She made a vow, saying, “O LORD of hosts, if You will indeed look on the affliction (suffering) of Your maidservant and remember, and not forget Your maidservant, but will give Your maidservant a son, then I will give him to the LORD all the days of his life; a razor shall never touch his head.”