'Vow' in the Bible
then it shall happen that to the place which Yahweh your God shall choose, to cause his name to dwell there, there you shall bring all that I command you: your burnt offerings, and your sacrifices, your tithes, and the wave offering of your hand, and all your choice vows which you vow to Yahweh.
You may not eat within your gates the tithe of your grain, or of your new wine, or of your oil, or the firstborn of your herd or of your flock, nor any of your vows which you vow, nor your freewill offerings, nor the wave offering of your hand;
You shall not bring the hire of a prostitute, or the wages of a dog, into the house of Yahweh your God for any vow: for even both these are an abomination to Yahweh your God.
When you shall vow a vow to Yahweh your God, you shall not be slack to pay it: for Yahweh your God will surely require it of you; and it would be sin in you.
But if you shall forbear to vow, it shall be no sin in you.