Revelation 9:17-21

17The horses and riders I saw in my vision looked like this: Their breastplates were fiery red, dark blue, and yellow as sulfur. The heads of the horses resembled the heads of lions, and out of their mouths came fire, smoke and sulfur. 18A third of mankind was killed by the three plagues of fire, smoke and sulfur that came out of their mouths.

19The power of the horses was in their mouths and in their tails; for their tails were like snakes, having heads with which they inflict injury. 20The rest of mankind who were not killed by these plagues still did not repent of the work of their hands; they did not stop worshiping demons, and idols of gold, silver, bronze, stone and wood—idols that cannot see or hear or walk. 21Nor did they repent of their murders, their magic arts, their sexual immorality or their thefts.