Hebrews 7:5-9

5And they indeed from among the sons of Levi, who receive the priesthood, have commandment to take tithes from the people according to the law, that is from their brethren, though these are come out of the loins of Abraham:

6but he who has no genealogy from them has tithed Abraham, and blessed him who had the promises.

7But beyond all gainsaying, the inferior is blessed by the better.

8And here dying men receive tithes; but there [one] of whom the witness is that he lives;

9and, so to speak, through Abraham, Levi also, who received tithes, has been made to pay tithes.