Rev.9.1  And the fifth angel blew his trumpet, and I saw a star fallen from heaven to earth, and he was given the key of the shaft of the bottomless pit;
Rev.9.2  he opened the shaft of the bottomless pit, and from the shaft rose smoke like the smoke of a great furnace, and the sun and the air were darkened with the smoke from the shaft.
Rev.9.11  They have as king over them the angel of the bottomless pit; his name in Hebrew is Abaddon, and in Greek he is called Apollyon.
Rev.11.7  And when they have finished their testimony, the beast that ascends from the bottomless pit will make war upon them and conquer them and kill them,
Rev.17.8  The beast that you saw was, and is not, and is to ascend from the bottomless pit and go to perdition; and the dwellers on earth whose names have not been written in the book of life from the foundation of the world, will marvel to behold the beast, because it was and is not and is to come.
Rev.20.1  Then I saw an angel coming down from heaven, holding in his hand the key of the bottomless pit and a great chain.