The Thousand-year Reign.
Then I saw an angel come down from heaven, holding in his hand the key to the abyss* and a heavy chain. He seized the dragon, the ancient serpent, which is the Devil or Satan, and tied it up for a thousand years and threw it into the abyss, which he locked over it and sealed, so that it could no longer lead the nations astray until the thousand years are completed. After this, it is to be released for a short time.