14 saying to the sixth angel who had the trumpet, "Release the four angels who are bound at the great river Euphrates." 15 So the four angels were released, who had been held ready for the hour, the day, the month, and the year, to kill a third of humankind. 16 The number of the troops of cavalry was two hundred million; I heard their number. 17 And this was how I saw the horses in my vision: the riders wore breastplates the color of fire and of sapphire and of sulfur; the heads of the horses were like lions' heads, and fire and smoke and sulfur came out of their mouths. 18 By these three plagues a third of humankind was killed, by the fire and smoke and sulfur coming out of their mouths. 19 For the power of the horses is in their mouths and in their tails; their tails are like serpents, having heads; and with them they inflict harm. 20 The rest of humankind, who were not killed by these plagues, did not repent of the works of their hands or give up worshiping demons and idols of gold and silver and bronze and stone and wood, which cannot see or hear or walk. 21 And they did not repent of their murders or their sorceries or their fornication or their thefts.
Matthew Henry's Commentary on Revelation 9:14-21
Commentary on Revelation 9:13-21
(Read Revelation 9:13-21)
The sixth angel sounded, and here the power of the Turks seems the subject. Their time is limited. They not only slew in war, but brought a poisonous and ruinous religion. The antichristian generation repented not under these dreadful judgments. From this sixth trumpet learn that God can make one enemy of the church a scourge and a plague to another. The idolatry in the remains of the eastern church and elsewhere, and the sins of professed Christians, render this prophecy and its fulfilment more wonderful. And the attentive reader of Scripture and history, may find his faith and hope strengthened by events, which in other respects fill his heart with anguish and his eyes with tears, while he sees that men who escape these plagues, repent not of their evil works, but go on with idolatries, wickedness, and cruelty, till wrath comes upon them to the utmost.