Hebrews 7:4-6

4Now consider how great this man was, unto whom even the patriarch Abraham gave the tenth of the spoils.

5And 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:

6But he whose descent is not counted from them received tithes of Abraham, and blessed him that had the promises.