And they had as king over them the angel of the bottomless pit, whose name in Hebrew is Abaddon, but in Greek he has the name Apollyon.
Revelation 9:11
Surrounding context
9:10 They had tails like scorpions, and there were stings in their tails. Their power was to hurt men five months.
9:11 And they had as king over them the angel of the bottomless pit, whose name in Hebrew is Abaddon, but in Greek he has the name Apollyon.
9:12 One woe is past. Behold, still two more woes are coming after these things.