Deuteronomy 23:19-21

Darby Translation

¹⁹ Thou shalt take no interest of thy brother, interest of money, interest of victuals, interest of anything that can be lent upon interest:

²⁰ of a foreigner thou mayest take interest, but of thy brother thou shalt not take interest; that Jehovah thy God may bless thee in all the business of thy hand in the land whither thou goest to possess it.

²¹ When thou vowest a vow to Jehovah thy God, thou shalt not delay to perform it; for Jehovah thy God will certainly require it of thee, and it shall be sin in thee.