Revelation 9:13–21 provides further insight into the assault by the northern invader. Earlier in chapter 9 we read about a horde of demonic locusts ascending from the bottomless pit. Now we read about two hundred million heavily armed cavalrymen, whose horses have heads like those of lions and tails like those of snakes. Four angels residing at the Euphrates allow the demonic army to advance across the river. The swarm of locusts described earlier may control or even possess these two hundred million cavalrymen. What follows is the annihilation of one third of humanity. However, the rest of humanity refuse to repent of their evil deeds, idolatry, murders, sorceries, or sexual immorality. Joel 2 and Ezekiel 38 also prophesy this northern army’s invasion of Israel. Revelation 10 will provide another interlude between the judgments.
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“Revelation 9:20” Bibleref.com
20 The rest of mankind, who were not killed with these plagues, didn’t repent of the works of their hands, that they wouldn’t worship demons, and the idols of gold, and of silver, and of brass, and of stone, and of wood; which can’t see, hear, or walk.