Revelation 20:1

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

For if God did not spare angels who sinned, but cast them into the pit and delivered them to chains of darkness, being kept for judgment;

and the living One; and I was dead, and behold, I am alive forever and ever, and I have the keys of death and of Hades.

Then I saw another strong angel coming down out of heaven, clothed with a cloud, and the rainbow was upon his head, and his face was like the sun, and his feet like pillars of fire;

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 finished. After these things he must be released for a short time.

Christ’s Thousand Year Reign