20Rejoice over her, O heaven, and you saints and apostles and prophets, for God has given judgment for you against her!”
Since Revelation 18:4 John has been hearing a heavenly voice providing divine revelation about how various parties in God’s creation should or will respond to the fall of Babylon. That voice continues speaking till the end of Revelation 18:20.
20 Rejoice over her, O heaven, and you saints and apostles and prophets, for God has given judgment for you against her!”