Hebrews 7:5-9

5Now the law requires the descendants of Levi who become priests to collect a tenth from the people—that is, from their fellow Israelites—even though they also are descended from Abraham. 6This man, however, did not trace his descent from Levi, yet he collected a tenth from Abraham and blessed him who had the promises. 7And without doubt the lesser is blessed by the greater. 8In the one case, the tenth is collected by people who die; but in the other case, by him who is declared to be living. 9One might even say that Levi, who collects the tenth, paid the tenth through Abraham,