Augustine of Hippo on the millennium & Christ's return

1 Then I saw an angel coming down from heaven with the key to the Abyss, holding in his hand a great chain. 2 He seized the dragon, that ancient serpent who is the devil and Satan, and bound him for a thousand years. 3 And he threw him into the Abyss, shut it, and sealed it over him, so that he could not deceive the nations until the thousand years were complete. After that, he must be released for a brief period of time. 4 Then I saw the thrones, and those seated on them had been given authority to judge. And I saw the souls of those who had been beheaded for their testimony of Jesus and for the word of God, and those who had not worshiped the beast or its image, and had not received its mark on their foreheads or hands. And they came to life and reigned with Christ for a thousand years. 5 The rest of the dead did not come back to life until the thousand years were complete. This is the first resurrection. 6 Blessed and holy are those who share in the first resurrection! The second death has no power over them, but they will be priests of God and of Christ, and will reign with Him for a thousand years.