Hebrews 7:8-12

8In the one case, men who will die receive a tenth, but in the other case, Scripture testifies that he lives.

9And in a sense Levi himself, who receives a tenth, has paid a tenth through Abraham,

10for he was still within his ancestor when Melchizedek met him.

11Now if perfection came through the Levitical priesthood (for on the basis of it the people received the law), what further need was there for another priest to appear, said to be according to the order of Melchizedek and not according to the order of Aaron?

12For when there is a change of the priesthood, there must be a change of law as well.