Rev 21:3

3 I heard a loud voice out of heaven saying, “Behold, God’s tent is with men, and he will dwell with them, and they will be his people, and God himself will be with them as their God. 

a loud voice from the throne – the voice of the Archangel, the Spirit of Christ, who speaks for the invisible God in verse 5. See also Rev 19:5, and Rev 19:10.

the tabernacle of God is among men – this can describe New Jerusalem, in heaven and earth, the holy City and the kingdom of God that began on earth. See also Rev 7:15.