The verses below all discuss or outline the fact that Jesus is our High Priest, and He is also the perfect Lamb of God. He gave up His own life as a perfect, unblemished sacrifice to God. With His sacrifice, Jesus purchased reconciliation to God for each one of us: our salvation.
In the Old Testament, the High Priest used the blood of bulls and lambs to pour upon the mercy seat as a sacrifice for the sins of the people. God had instructed His people to build Him a sanctuary within which was the “Ark of the Testimony” which held the “mercy seat.”
. . . who does not need daily, as those high priests, to offer up sacrifices, first for His own sins and then for the people’s, for this He did once for all when He offered up Himself. (Heb 7:27)
Not with the blood of goats and calves, but with His own blood He entered the Most Holy Place once for all, having obtained eternal redemption. (Heb 9:12)
For the death that He died, He died to sin once for all; but the life that He lives, He lives to God. (Rom 6:10)
In Hebrews 12:24, the Holy Spirit teaches us that the blood of Jesus “speaks better things than the blood of Abel.” God was the Avenger of “righteous Abel,” but Jesus Christ, the righteous, is our Advocate with the Father, and He is the appeasement for our sins. (1 Joh 2:1-2)
The Son of God, Jesus Christ, is unique in all of time and eternity. He has done what no one else could do. He completed His mission on earth perfectly. He is the perfect Priest and the perfect atoning Sacrifice: the Lamb of God. (See Heb 3:1; 4:14; 6:20; Joh 1:29, 36; Rev 7:17) All glory to His name.