Revelation 20:1-6 Revised Standard Version Catholic Edition (RSVCE)
The Thousand Years
20 Then I saw an angel coming down from heaven, holding in his hand the key of the bottomless pit and a great chain. 2 And he seized the dragon, that ancient serpent, who is the Devil and Satan, and bound him for a thousand years, 3 and threw him into the pit, and shut it and sealed it over him, that he should deceive the nations no more, till the thousand years were ended.[a] After that he must be loosed for a little while.
4 Then I saw thrones, and seated on them were those to whom judgment was committed. Also I saw the souls of those who had been beheaded for their testimony to Jesus and for the word of God, and who had not worshiped the beast or its image and had not received its mark on their foreheads or their hands. They came to life, and reigned with Christ a thousand years. 5 The rest of the dead did not come to life until the thousand years were ended. This is the first resurrection. 6 Blessed and holy is he who shares in the first resurrection! Over such the second death has no power, but they shall be priests of God and of Christ, and they shall reign with him a thousand years.