Hebrews 7:12-17
7:12 For when the priesthood changes, a change in the law must come as well.
7:13 Yet the one these things are spoken about belongs to a different tribe, and no one from that tribe has ever officiated at the altar.
7:14 For it is clear that our Lord is descended from Judah, yet Moses said nothing about priests in connection with that tribe.
7:15 And this is even clearer if another priest arises in the likeness of Melchizedek,
7:16 who has become a priest not by a legal regulation about physical descent but by the power of an indestructible life.
7:17 For here is the testimony about him: “You are a priest forever in the order of Melchizedek.”