Revelation 9:11

11 They had as their king[a] the angel of the abyss; his name in Hebrew is Abaddon,[b] and in Greek he has the name Apollyon.[c]

Revelation 9:11 In-Context

9 they had chests like iron breastplates; the sound of their wings was like the sound of chariots with many horses rushing into battle;
10 and they had tails with stingers, like scorpions, so that with their tails they had the power to harm people for five months.
11 They had as their king the angel of the abyss; his name in Hebrew is Abaddon, and in Greek he has the name Apollyon.
12 The first woe has passed. There are still two more woes to come after this.
13 The sixth angel blew his trumpet. From the four horns of the gold altar that is before God, I heard a voice

Footnotes 3

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