Now the main point in what has been said is this: we have such a high priest, who has taken His seat at the right hand of the throne of the Majesty in the heavens, a minister in the sanctuary, and in the true tabernacle, which the Lord pitched, not man. —Hebrews 8:1–2
Christmas is the replacement of shadows with the real thing. Hebrews 8:1–2 is a kind of summary statement. The point is that the one priest who goes between us and God, and makes us right with God, and prays for us to God, is not an ordinary, weak, sinful, dying, priest like in the Old Testament days. He is the Son of God—strong, sinless, with an indestructible life.
Not only that, he is not ministering in an earthly tabernacle with all its limitations of place and size and wearing out and being moth-eaten and being soaked and burned
and torn and stolen. No, verse 2 says that Christ is ministering for us in a “true tabernacle, which the Lord pitched, not man.” This is the real thing in heaven. This is what cast on Mount Sinai a shadow that Moses copied.
According to verse 1, another great thing about the reality which is greater than the shadow is that our High Priest is seated at the right hand of the Majesty in heaven. No Old Testament priest could ever say that.
Jesus deals directly with God the Father. He has a place of honor beside God. He is loved and respected infinitely by God. He is constantly with God. This is not shadow reality like curtains and bowls and tables and candles and robes and tassels and sheep and goats and pigeons. This is final, ultimate reality: God and his Son interacting in love and holiness for our eternal salvation.
Ultimate reality is the persons of the Godhead in relationship, dealing with each other concerning how their majesty and holiness and love and justice and goodness and truth shall be manifest in a redeemed people.