Romans 10:7 or 'WHO WILL DESCEND INTO THE ABYSS?' (that is, to bring Christ up from the dead)."

Revelation 9:1 Then the fifth angel sounded, and I saw a star from heaven which had fallen to the earth; and the key of the bottomless pit was given to him.

Revelation 9:11 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.

Revelation 11:7 When they have finished their testimony, the beast that comes up out of the abyss will make war with them, and overcome them and kill them.

Revelation 17:8 "The beast that you saw was, and is not, and is about to come up out of the abyss and go to destruction. And those who dwell on the earth, whose name has not been written in the book of life from the foundation of the world, will wonder when they see the beast, that he was and is not and will come.

Revelation 20:1 Then I saw an angel coming down from heaven, holding the key of the abyss and a great chain in his hand.

Revelation 20:3 and he threw him into the abyss, and shut it and sealed it over him, so that he would not deceive the nations any longer, until the thousand years were completed; after these things he must be released for a short time. (NASB ©1995)