Hebrews 7:8-12

8Here mortal men receive tithes, but there he receives them, of whom it is witnessed that he lives.

9Even Levi, who receives tithes, paid tithes through Abraham, so to speak,

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

11Therefore, if perfection were through the Levitical priesthood (for under it the people received the law), what further need was there that another priest should rise according to the order of Melchizedek, and not be called according to the order of Aaron?

12For the priesthood being changed, of necessity there is also a change of the law.