Revelation 9:11-13

Young's Literal Translation

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,