Revelation 9:9-11

Darby Translation

⁹ and they had breastplates as breastplates of iron, and the sound of their wings [was] as the sound of chariots of many horses running to war;

¹⁰ and they have tails like scorpions, and stings; and their power [was] in their tails to hurt men five months.

¹¹ They have a king over them, the angel of the abyss: his name in Hebrew, Abaddon, and in Greek he has [for] name Apollyon.