'Vow' in the Bible

She vowed a vow, and said, "Yahweh of Armies, if you will indeed look on the affliction of your handmaid, and remember me, and not forget your handmaid, but will give to your handmaid a boy, then I will give him to Yahweh all the days of his life, and no razor shall come on his head."

The man Elkanah, and all his house, went up to offer to Yahweh the yearly sacrifice, and his vow.