Jesus is our Great High Priest: You are a priest forever, in the order of Melchizedek. Hebrews 5:6

A priest is a mediator between God and men, explains Paul. Jesus proclaims the Kingdom of Heaven and brings us a new covenant with God, no longer based on the fulfillment of a rigid and immovable law, but based on the freedom of the spirit: "Be perfect, therefore, as your heavenly Father is perfect" Matthew 5:48, "Be merciful just as your Father is merciful" Luke 6:36, "Be holy, because I am holy" Peter 1:16.
This is why this new covenant, by bringing a change in the law, gives rise to a new priesthood, because there is no greater mediator with God than Jesus: "But in fact the ministry Jesus has received is as superior to theirs as the covenant of which he is mediator is superior to the old one, since the new covenant is established on better promises.
For if there had been nothing wrong with that first covenant, no place would have been sought for another" Hebrews 8:6-7.
The apostle Paul explains to us that Jesus is the great high priest of the new covenant with God, but Jesus is not a descendant of the tribe of Levi, that is why the priesthood of Christ is according to the order of Melchizedek, king of Salem.
The apostle Paul, in a short text, establishes the new priesthood of Christ:
"Christ did not take on himself the glory of becoming a high priest. But God said to him, ´You are my Son; today I have become your Father.´ And he says in another place, ´You are a priest forever, in the order of Melchizedek.´
During the days of Jesus' life on earth, he offered up prayers and petitions with fervent cries and tears to the one who could save him from death, and he was heard because of his reverent submission. Son though he was, he learned obedience from what he suffered and, once made perfect, he became the source of eternal salvation for all who obey him and was designated by God to be high priest in the order of Melchizedek." Hebrews 5:5-10.

Only Jesus with his new priesthood can lead us to salvation and the spiritual perfection: "He has made perfect forever those who are being made holy", Hebrews 10:14.
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