Hebrews 7:4-9
4 Just think how great he was: Even the patriarch Abraham gave him a tenth of the plunder!
5 Now the law requires the descendants of Levi who become priests to collect a tenth from the people—that is, their brothers—even though their brothers are descended from Abraham.
6 This man, however, did not trace his descent from Levi, yet he collected a tenth from Abraham and blessed him who had the promises.
7 And without doubt the lesser person is blessed by the greater.
8 In the one case, the tenth is collected by men who die; but in the other case, by him who is declared to be living.
9 One might even say that Levi, who collects the tenth, paid the tenth through Abraham,