Hebrews 7:11-14

11If therefore perfection were by the Levitical priesthood, (for under it the people received the law,) what further need was there that another priest should rise after the order of Melchizedek, and not be called after the order of Aaron? 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.