Hebrews 7 tells us that our legal requirements were fulfilled by Christ.
Paul reminded us that under the Levitical priesthood, the people received the law. Through those requirements given by the priesthood, we never reached perfection.
Paul asked: "If perfection had been attainable through the Levitical priesthood, what further need would there have been for another priest to rise after the order of Melchizedek?"
He said that when there is a change in priesthood, there also is a change in the law. When Christ came in the order of Melchizedek, he did not come after the order of Aaron, which was a change. This High Priest came from another tribe in the earthly realm, from one which no one has ever served as a high priest at the altar. Christ descended from the line of Judah, and Moses never mentioned priests descending from that bloodline in physical bodies.
Therefore Christ came not on the basis of a legal requirement by His earthly bloodline, but a heavenly bloodline through power of an indestructible life! The scriptures witnessed Christ, saying "You are a priest forever after the order of Melchizedek!"
Paul correctly divides the two schools of thought. On one hand, we have a former commandment to become righteous by the way in which we live our lives. Laws were given to the people, and they were to follow those laws or death would pursue. Paul said that former commandment had been set aside because of its weakness and uselessness. Through the law, nothing was made perfect.
On the other hand, Paul said a better hope is introduced. Though we are sinners, we can become heirs to the kingdom by grace through faith in Jesus Christ! Through this better hope, we draw nearer to God!
The required oath was made long before Jesus was born on the earth. Though the former priests had no such requirement, Christ brought a new covenant which required an oath to seal the change. The oath for Christ was made when a former priest who said, "The Lord has sworn and will not change his mind. You are a priest forever!" This statement makes Jesus Christ the guarantor of a better covenant!
There were several former priests. They could not become a priest forever, prevented by death under the old covenant. The priesthood under the old covenant was an earthly priesthood, but Christ comes as a heavenly High Priest. He holds His office of priesthood permanently because He continues forever. Because of this, Paul said that Christ is able to save those who draw near to God through Christ -- even those who are scattered to the uttermost. Christ always lives to make intercession for the sinners.
Paul said that it was fitting for us to have such a High Priest. He came holy, innocent, unstained, separated from sinners, and was exalted above the heavens. Christ never needed to sacrifice daily for His sins; He had none! He sacrificed for the sins of the world when He offered Himself as the ultimate Sacrifice!
The law appointed men in their weakness to become high priests. All men are born into sin. Christ came perfect, through the word of the oath which came after the law. He was appointed as our High Priests through God's only Son. Our High Priest remains perfect forever.
As Christians, we should ask ourselves: Are we made perfect through Christ? Do we vainly try to follow laws to gain perfection, choosing the earthly covenant rather than the heavenly covenant? Have we chosen an earthly high priest rather than the Heavenly High Priest, God's only Son? Have we chosen not to accept our new covenant of perfection to remain under an old covenant of death?