Hebrews 7:12-17

12For the priesthood being changed, there is made of necessity a change also of the law. 13For he of whom these things are spoken pertaineth to another tribe, of which no man gave attendance at the altar. 14For it is evident that our Lord sprang from Judah; of which tribe Moses spoke nothing concerning priesthood. 15And it is yet far more evident: for that after the similitude of Melchizedek there ariseth another priest, 16Who is made, not after the law of a carnal commandment, but after the power of an endless life. 17For he testifieth, Thou art a priest for ever after the order of Melchizedek.