What does Hebrews 8:5 mean?
A major point made in the book of Hebrews is that God's plan to save mankind through Jesus Christ is not a "change" in His will. Rather, this has been the intent of God all along. As support for that idea, the writer has already pointed out places in the Old Testament where God made promises which foretell the replacement of the Levitical law with a better covenant. Prior verses hinted at the idea of God using the laws given to Moses as symbols of what was to come. This verse makes that claim directly.The writer cites Exodus 25:40, which is similar to Exodus 25:9, where Moses is told that he is to follow the "pattern" given to him by God. This is a theme often explored in the Bible, that God will use events and objects in order to symbolize His plan of salvation. Those patterns, often called "types," become useful as explanations of God's will. Two potent examples come from Israel's own history. One is the events of the first Passover, which symbolized mankind's salvation through faith in the sacrifice of Christ (Exodus 12:1–28). Another is the incident with the bronze serpent, which again symbolized salvation rooted in faith, as well as providing a shadowy reference to Jesus' crucifixion (Numbers 21:4–9).
In the book of Hebrews, the writer argues that all of the Old Covenant rituals and objects are meant to be shadows of the "real" plan of God. That plan is fulfilled in Jesus Christ.