Hebrews 7:8-12

8In the one case tithes are received by mortal men, but in the other case, by one of whom it is testified that he lives.

9One might even say that Levi himself, who receives tithes, paid tithes through Abraham,

10for he was still in the loins of his ancestor when Melchizedek met him.

11Now if perfection had been attainable through the Levitical priesthood (for under it the people received the law), what further need would there have been for another priest to arise after the order of Melchizedek, rather than one named after the order of Aaron?

12For when there is a change in the priesthood, there is necessarily a change in the law as well.