Revelation 16:16

Now there is in Jerusalem by the sheep gate a pool, which is called in Hebrew Bethesda, having five porticoes.

They have as king over them, the angel of the abyss. His name in Hebrew is Abaddon, and in the Greek he has the name Apollyon.

Then I heard a loud voice from the sanctuary, saying to the seven angels, “Go and pour out on the earth the seven bowls of the wrath of God.”

Then I saw the beast and the kings of the earth and their armies assembled to make war with Him who sits on the horse and with His army.

I bear witness to everyone who hears the words of the prophecy of this book: If anyone adds to them, God will add to him the plagues which are written in this book.