Revelation 9:11
And they had a king over them, the angel of the bottomless pit, whose name in the Hebrew tongue Abaddon, but in the Greek tongue has name Apollyon.
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Context
9 And they had breastplates, as it were breastplates of iron; and the sound of their wings as the sound of chariots of many horses running to battle.
10 And they had tails like unto scorpions, and there were stings in their tails: and their power to hurt men five months.
11 And they had a king over them, the angel of the bottomless pit, whose name in the Hebrew tongue Abaddon, but in the Greek tongue has name Apollyon.
12 One woe is past; , behold, there come two woes more hereafter.
13 And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before Elohim,