Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.
Fear God - forerunner to embracing the love of God in the Gospel. Repentance accompanies faith.
Give glory to him - not to the beast (cf. Jeremiah 13:16; Revelation 13:4).
The hour (the definite time) of his Judgment. "Judgment," not general, but that upon Babylon, the beast, anti his worshippers (Revelation 14:8-12).
Worship him that made heaven - not Antichrist, who "sitteth in the temple of God, showing himself that he is God" (cf. Acts 14:15).
Sea ... fountains - distinguished in Revelation 8:8; Revelation 8:10.