I Samuel 1:3, 11

This man went up from his city yearly to worship and sacrifice to the LORD of hosts in Shiloh. Also the two sons of Eli, Hophni and Phinehas, the priests of the LORD, were there.

Then she made a vow and said, “O LORD of hosts, if You will indeed look on the affliction of Your maidservant and remember me, and not forget Your maidservant, but will give Your maidservant a male child, then I will give him to the LORD all the days of his life, and no razor shall come upon his head.”