1 Samuel 1:11
And she vowed a vow, and said, O LORD of hosts, 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 the LORD all the days of his life, and there shall no razor come upon his head.
1 Samuel 1:21
And the man Elkanah, and all his house, went up to offer unto the LORD the yearly sacrifice, and his vow.