Revelation 9:19 in the King James Version
For their power is in their mouth, and in their tails: for their tails were like unto serpents, and had heads, and with them they do hurt.
Context
18 By these three plagues, one third of mankind was killed: by the fire, the smoke, and the sulfur, which proceeded out of their mouths.
19 For the power of the horses is in their mouths and in their tails. For their tails are like serpents, and have heads; and with them they harm.
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.