1 Samuel 1:3, 11

Now this man used to go up year by year from his city to worship and to sacrifice to the LORD of hosts at Shiloh, where the two sons of Eli, Hophni and Phinehas, were priests of the LORD.

And she vowed a vow and said, “O LORD of hosts, if you will indeed look on the affliction of your servant and remember me and not forget your servant, but will give to your servant a son, then I will give him to the LORD all the days of his life, and no razor shall touch his head.”