Hebrews 7:8-12

8And here men that die receive tithes; but there one, of whom it is witnessed that he liveth. 9And, so to say, through Abraham even Levi, who receiveth tithes, hath paid tithes; 10for he was yet in the loins of his father, when Melchizedek met him.

11Now if there was perfection through the Levitical priesthood (for under it hath the people received the law), what further need was there that another priest should arise after the order of Melchizedek, and not be reckoned after the order of Aaron? 12For the priesthood being changed, there is made of necessity a change also of the law.