Hebrews 7:11 If perfection could have been attained through the Levitical priesthood—and indeed the law given to the people established that priesthood—why was there still need for another priest to come, one in the order of Melchizedek, not in the order of Aaron? 12 For when the priesthood is changed, the law must be changed also. 13 He of whom these things are said belonged to a different tribe, and no one from that tribe has ever served at the altar. 14 For it is clear that our Lord descended from Judah, and in regard to that tribe Moses said nothing about priests. 15 And what we have said is even more clear if another priest like Melchizedek appears, 16 one who has become a priest not on the basis of a regulation as to his ancestry but on the basis of the power of an indestructible life.
Barclay on Hebrews 7: “…religion is access to God…That was the theory of the matter. But in practice life showed that was precisely what the priesthood and the sacrificial system could not do. There was no escaping the human estrangement from God which followed sin; and the problem was that not all the efforts of the priesthood and not all the sacrifices could restore that lost relationship.”
There’s a whole slew of words that might apply to this odd [and confusing] reference to Melchizadek who apparently had no genealogy at all. Call it an allegory, parable, analogy or metaphor. No matter which word you choose it speaks of a change that was A Big Shake-Up.
Jesus has completed the complexity and confusion of that old system to restore us to God. It’s called the reality of grace and forgiveness. We no longer need to be in the right place at the right time making the right sacrifice to cover the right rule…it’s finished.