Hebrews 7:4-6

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

5And indeed those who are of the sons of Levi, who receive the priesthood, have a commandment to receive tithes from the people according to the law, that is, from their brethren, though they have come from the loins of Abraham;

6but he whose genealogy is not derived from them received tithes from Abraham and blessed him who had the promises.