Revelation 9:11 in the King James Version
And they had a king over them, which is the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon, but in the Greek tongue hath his name Apollyon.
Context
10 They have tails like those of scorpions, with stingers. In their tails they have power to harm men for five months.
11 They have over them as king the angel of the abyss. His name in Hebrew is “Abaddon”, but in Greek, he has the name “Apollyon”.
12 The first woe is past. Behold, there are still two woes coming after this.