Revelation 9:16

12 The first woe has passed. Behold, two woes are still to follow.

13 Then the sixth angel sounded his trumpet, and I heard a voice from the four horns of the golden altar before God

14 saying to the sixth angel with the trumpet, “Release the four angels who are bound at the great river Euphrates.”

15 So the four angels who had been prepared for this hour and day and month and year were released to kill a third of mankind.

16 And the number of mounted troops was two hundred million; I heard their number.

17 Now the horses and riders in my vision looked like this: The riders had breastplates the colors of fire, sapphire, and sulfur. The heads of the horses were like the heads of lions, and out of their mouths proceeded fire, smoke, and sulfur.

18 A third of mankind was killed by the three plagues of fire, smoke, and sulfur that proceeded from their mouths.

19 For the power of the horses was in their mouths and in their tails; indeed, their tails were like snakes, having heads with which to inflict harm.

20 Now the rest of mankind who were not killed by these plagues still did not repent of the works of their hands. They did not stop worshiping demons and idols of gold, silver, bronze, stone, and wood, which cannot see or hear or walk.

Read all of Revelation 9