Revelation 22:3 says concerning New Jerusalem:
The verse tells us that God and the Lamb will be on the throne. God on the throne is obvious but for the Lamb, Jesus, the God-man, it is helpful to consider additional verses.
Matthew 28:18 “Jesus came and spoke to them, saying, All authority has been given to Me in heaven and on earth.” Jesus, the Lamb, was given all authority in resurrection.
Acts 2:36, in resurrection, “God has made Him both Lord and Christ, this Jesus whom you have crucified.” Acts 10:36, “Jesus Christ (this One is Lord of all)”
Ephesians 1:19-23 “the might of His [God, the Father of glory] strength, which He caused to operate in Christ in raising Him from the dead and seating Him at His right hand in the heavenlies, far above all rule and authority and power and lordship and every name that is named not only in this age but also in that which is to come; and He subjected all things under His feet and gave Him to be Head over all things to the church, which is His Body”
This portion tells us that God raised Christ from the dead, exalted Him to the heavens, enthroned Him far above all, subjected all things under Him, and gave Him as Head over all. All these steps are to His Body now and to New Jerusalem in eternity.
The Lamb Jesus Christ will be on the throne in New Jerusalem but we should not wait passively. Hebrews 4:16 exhorts us to “come forward with boldness to the throne of grace that we may receive mercy and find grace.”
How can we come to the throne of God and the Lamb, Christ, in heaven while we still live on earth? The secret is our spirit, referred to in v. 12. The very Christ who is sitting on the throne in heaven (Rom. 8:34) is also now in us (Rom. 8:10), that is, in our spirit (2 Tim. 4:22), where the habitation of God is (Eph. 2:22).*
Let us come forward to the throne now on our way to New Jerusalem.