Deuteronomy 23:19

15You shall not deliver to his master a servant who has escaped from his master to you.

16He shall dwell with you, among you, in the place which he shall choose within one of your gates, where it pleases him best. You shall not oppress him.

17There shall be no prostitute of the daughters of Israel, neither shall there be a sodomite of the sons of Israel.

18You shall not bring the hire of a prostitute, or the wages of a male prostitute, into the house of the LORD your God for any vow; for both of these are an abomination to the LORD your God.

19You shall not lend on interest to your brother: interest of money, interest of food, interest of anything that is lent on interest.

20You may charge a foreigner interest; but you shall not charge your brother interest, that the LORD your God may bless you in all that you put your hand to, in the land where you go in to possess it.

21When you vow a vow to the LORD your God, you shall not be slack to pay it, for the LORD your God will surely require it of you; and it would be sin in you.

22But if you refrain from making a vow, it shall be no sin in you.

23You shall observe and do that which has gone out of your lips. Whatever you have vowed to the LORD your God as a free will offering, which you have promised with your mouth, you must do.