Revelation 9:2

and he looked down toward Sodom and Gomorrah, and toward all the land of the valley, and he saw, and behold, the smoke of the land went up like the smoke of a furnace.

“But whoever does not fall down and worship shall immediately be cast into the midst of a furnace of blazing fire.”

And they were pleading with Him not to command them to go away into the abyss.

Then the fifth angel sounded. Then I saw a star from heaven which had fallen to the earth, and the key of the pit of the abyss was given to him.

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 the fifth angel poured out his bowl on the throne of the beast, and his kingdom became darkened; and they gnawed their tongues because of pain,