Revelation 9:11 YLT

⁹  and they had breastplates as breastplates of iron, and the noise of their wings 'is' as the noise of chariots of many horses running to battle;

¹⁰  and they have tails like to scorpions, and stings were in their tails; and their authority 'is' to injure men five months;

¹¹  and they have over them a king -- the messenger of the abyss -- a name 'is' to him in Hebrew, Abaddon, and in the Greek he hath a name, Apollyon.

¹²  The first wo did go forth, lo, there come yet two woes after these things.

¹³  And the sixth messenger did sound, and I heard a voice out of the four horns of the altar of gold that is before God,