If you make a vow to the LORD your God, do not be slow to keep it, because He will surely require it of you, and you will be guilty of sin.
Jewish Publication Society of America Version (JPS1917) - Deuteronomy 23:21 >(23-22) When thou shalt vow a vow unto the LORD thy God, thou shalt not be slack to pay it; for the LORD thy God will surely require it of thee; and it will be sin in thee.