In the New Testament, the Holy Spirit writing through the author of the book of Hebrews in chapter 7, makes a contrast between the former priesthood of priests who were “weak”, “useless” (Hebrews 7:18) and were “many” (Hebrews 7:23) and the Priesthood that God has appointed in His Son, Jesus Christ. The Bible teaches that the Priesthood of Jesus Christ, the living God, exceeds the need of an earthly priesthood because Jesus “continues forever” (Hebrews 7:24), is “always able to make intercession” for us (Hebrews 7:25) and is able to save “completely” (Hebrews 7:25) those of us who draw near to God through Him (Hebrews 7:24, 25).
Hebrews 7:12 also states that if there is a change in the priesthood there must be a change in the law as well, meaning the change in priesthood must be explained and written in Gods Word, which it has. However, nothing is written in the Bible about the Orthodox priesthood. This would have to be the case if it is appointed by God. When we read the detailed information God has chosen to include in His Word, especially of the priesthood in the Old Testament, it is surprising that He would leave out the details of a New Testament priesthood as the New Testament far exceeds the Old in glory (2 Corinthians 3:9). This would be inconsistent with God’s character and His Word.
When there is a change in the priesthood, there is necessarily a change in the law as well. (Hebrews 7:12)
In these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world. He is the radiance of the glory of God and the exact imprint of his nature, and he upholds the universe by the word of his power. (Hebrews 1:2, 3)
When Christ appeared as a high priest of the good things that have come, He entered through the greater and more perfect tabernacle, not made with hands, that is to say, not of this creation; and not through the blood of goats and calves, but through His own blood, He entered the holy place once for all, having obtained eternal redemption. (Hebrews 9: 11, 12)
The LORD has sworn and will not change his mind: “You are a priest forever”. (Psalm 110:4)
He says in another place, “You are a priest forever”. (Hebrews 5:6)
Jesus has gone as a forerunner on our behalf, having become a high priest forever. (Hebrews 6:20)
For it is witnessed of him, “You are a priest forever”. (Hebrews 7:17)
He became a priest with an oath when God said to him: “The Lord has sworn and will not change his mind: “You are a priest forever”. (Hebrews 7:21)
He holds His priesthood permanently, because He lives forever. (Hebrews 7:24)
The law appoints as high priests men in all their weakness; but the oath, which came after the law, appointed the Son, who has been made perfect forever. (Hebrews 7:28)