'Vow' in the Bible

She {made a vow} and said: "O Yahweh of hosts, if you will look with compassion on the misery of your female servant, and will remember me, and not forget your female servant, and will give to your female servant {a male child} then I will give him to Yahweh all the days of his life, and a razor will never pass over his head."

So the man Elkanah went up with all his household {to make the annual sacrifice} to Yahweh and [to pay] his vow.