20 And inasmuch as not without an oath he was made priest:
21 (For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)
22 By so much was Jesus made a surety of a better testament.
23 And they truly were many priests, because they were not suffered to continue by reason of death:
24 But this man, because he continueth ever, hath an unchangeable priesthood.
25 Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them.
26 For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens;
27 Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself.
28 For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated for evermore.
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Continuing the discussion of Christ as High Priest, the author of the epistle draws attention to the key difference that distinguishes Him from every high priest of the Levitical priesthood. The matter concerns death, which weighs upon every fallen person. And the point here is not only that after the fall every person is mortal.
The point above all is that death defines the whole life of a fallen person. In our ordinary state we all live while dying, and we begin to die from the very moment of our conception, even before we come into the world. Death has become an inseparable part of our fallen life. Meanwhile, it is precisely death that prevents a person, and indeed the whole universe, from being sanctified completely.
It is no accident that Yahwism traditionally sets against holiness (not in the sense of righteousness, as we often use the word today, but in the sense of consecration) not even sin, but impurity, as that which destroys the fullness and integrity of creation, bringing death into it and preventing it from being sanctified, from becoming part of the Kingdom completely and in fullness.
Of course, sin also defiles, but it is only part of the evil in which the world lies, the part directly connected with a person's spiritual life and spiritual self-determination. To be sanctified in fullness oneself and to become a mediator in this process for others, one must be free from death, and therefore free from the evil in which the world lies, including human sinfulness. But by definition there could be no such high priest from among the Levites: there are no sinless people on earth, and no examples of the living Torah are known among the Levitical priesthood.
It was necessary to resort to special purifying sacrifices for the priests. These, of course, did not free them from sin, but they gave the priest the ability to act, so to speak, "over" his own sinful nature, not allowing it to show itself while the priest was carrying out his service. But this was a half measure: the priest himself remained the same, and as soon as he moved away from the altar and returned to ordinary life, sin again gained power over him. That is precisely why, after the purifying sacrifices, the Torah forbids priests to leave the courtyard of the Tabernacle (or, later, the Temple courtyard) until the end of the period of their service, which could last from one day to several weeks.
Throughout this time the priest had to live by the Tabernacle or by the Temple. In practice, however, this state of affairs meant that the priest remained a priest in the full sense of the word only for a certain time, while he was serving: it was then that God, through his service and with his participation, sanctified the people, while at all other times the priest was no different from anyone else. With Christ it is not so: He is High Priest always; His whole life is the process by which He sanctifies the Church as His body, for sin has no power over Him, and therefore death has no place in His life. Once He comes into contact with it, Jesus immediately conquers it through the resurrection. Such a High Priest can sanctify His people and the whole world in fullness, so that it may become part of the Kingdom, as God intended from the very beginning.
Other notes
For Heb 7:15-28
15 And it is yet far more evident: for that after the similitude of Melchisedec there ariseth another priest,
16 Who is made, not after the law of a carnal commandment, but after the power of an endless life.
17 For he testifieth, Thou art a priest for ever after the order of Melchisedec.
18 For there is verily a disannulling of the commandment going before for the weakness and unprofitableness thereof.
19 For the law made nothing perfect, but the bringing in of a better hope did; by the which we draw nigh unto God.
20 And inasmuch as not without an oath he was made priest:
21 (For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)
22 By so much was Jesus made a surety of a better testament.
23 And they truly were many priests, because they were not suffered to continue by reason of death:
24 But this man, because he continueth ever, hath an unchangeable priesthood.
25 Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them.
26 For such an high priest became us, who is holy, harmless, undefiled, separate from sinners, and made higher than the heavens;
27 Who needeth not daily, as those high priests, to offer up sacrifice, first for his own sins, and then for the people's: for this he did once, when he offered up himself.
28 For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated for evermore.
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In speaking in today’s reading about the enduring priesthood of Jesus Christ, the apostle Paul draws our attention to...
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In speaking in today’s reading about the enduring priesthood of Jesus Christ, the apostle Paul draws our attention to an important feature of the law. He says that the law, a body of prescriptive and prohibitive rules and ordinances, is a strictly functional thing. The apostle emphasizes that the law is powerless to perfect human nature. For this reason, in his view, a commandment of the law can be set aside because of its weakness and uselessness. Even after two thousand years of the Christian Church, human religious psychology rebels against such freedom. It seems that a commandment must be an image of the truth so that we can rely on it. The apostle, however, emphasizes that in the New Covenant a greater and better hope is introduced for us: to be guided by the One who Himself is the Way, the Truth, and the Life. On this basis, the apostle concludes that the New Covenant is superior. For us in practice, this means above all that there can be no universal ready-made solutions in the Christian faith, and that whatever resembles law in the life of Christians testifies to our hardness of heart and our inability to obey the Holy Spirit.