Hebrews 7
4 Ref Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.
5 Ref And verily they that are of the sons of Levi, who receive the office of the priesthood, have a commandment to take tithes of the people according to the law, that is, of their brethren, though they come out of the loins of Abraham:
6 Ref But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.