Hebrews 7:11-18

11Now if perfection [a perfect fellowship between God and the worshiper] had been attained through the Levitical priesthood (for under it the people were given the Law) what further need was there for another and different kind of priest to arise, one in the manner of Melchizedek, rather than one appointed to the order of Aaron?

12For when there is a change in the priesthood, there is of necessity a change of the law [concerning the priesthood] as well.

13For the One of whom these things are said belonged [not to the priestly line of Levi but] to another tribe, from which no one has officiated or served at the altar.

14For it is evident that our Lord descended from [the tribe of] Judah, and Moses mentioned nothing about priests in connection with that tribe.

15And this becomes even more evident if another priest arises in the likeness of Melchizedek,

16who has become a priest, not on the basis of a physical and legal requirement in the Law [concerning his ancestry as a descendant of Levi], but on the basis of the power of an indestructible and endless life.

17For it is attested [by God] of Him, “You (Christ) are a Priest forever According to the order of Melchizedek.”

18For, on the one hand, a former commandment is cancelled because of its weakness and uselessness [because of its inability to justify the sinner before God]