22 This makes Jesus the guarantor of a better covenant.
23 The former priests were many in number, because they were prevented by death from continuing in office, 24 but he holds his priesthood permanently, because he continues forever. 25 Consequently, he is able to save to the uttermost those who draw near to God through him, since he always lives to make intercession for them.
26 For it was indeed fitting that we should have such a high priest, holy, innocent, unstained, separated from sinners, and exalted above the heavens. 27 He has no need, like those high priests, to offer sacrifices daily, first for his own sins and then for those of the people, since he did this once for all when he offered up himself. 28 For the law appoints men in their weakness as high priests, but the word of the oath, which came later than the law, appoints a Son who has been made perfect forever.
Only God can guarantee a better covenant after He sets aside the old covenant. Jesus is able to fulfill the office of High Priest forever because He lives forever. Every priest before Jesus died but our Savior lives forever.
Just look at how the Lord describes Jesus, the Superior High Priest in verse 26: holy, innocent, unstained, separated from sinners, and exalted above the heavens…and because of Who He is, He has no need to repeatedly make an offering for his sin and then the sins of others for Jesus was sinless, separated from sinners. “For He made Him who knew no sin to be sin for us, that we might become the righteousness of God in Him (2 Corinthians 5:21).”
For God has done what the law, weakened by the flesh, could not do. By sending His own Son in the likeness of sinful flesh and for sin, He condemned sin in the flesh, 4 in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit. Romans 8:3-4
The Lord appointed Jesus and took an oath that His appointment is forever. The fact that God took an oath proves the importance of this permanent and unchanging covenant. It has been settled in heaven forever.
When I think about the lack of integrity, relativism, and subjectivity of today, I am comforted to know that Abba, Father is faithful to His Word. We need not have one concern that our High Priest will die or change His mind. “God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good?“Numbers 23:19
“In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit, 14 who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.” Ephesians 1:13-14