Revelation 20:1-2

And then I saw an angel descending from heaven, holding the key of the abyss (the bottomless pit) and a great chain was in his hand. And he overpowered and laid hold of the dragon, that old serpent [of primeval times], who is the devil and Satan, and bound him [securely] for a thousand years (a millennium); [Rev 12:7-9, 12, 15]

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