'Vow' in the Bible

And it cometh to pass, at the end of forty years, that Absalom saith unto the king, 'Let me go, I pray thee, and I complete my vow, that I vowed to Jehovah in Hebron,

for a vow hath thy servant vowed in my dwelling in Geshur, in Aram, saying, If Jehovah doth certainly bring me back to Jerusalem, then I have served Jehovah.'