Hebrews 7:12-17

12For when the priesthood is changed, the law must be changed as well.

13He of whom these things are said belonged to a different tribe, from which no one has ever served at the altar. 14For it is clear that our Lord descended from Judah, a tribe as to which Moses said nothing about priests.

15And this point is even more clear if another priest like Melchizedek appears, 16one who has become a priest not by a law of succession, but by the power of an indestructible life. 17For it is testified: