Revelation 20:1-3

The Thousand Years 1And I saw an angel coming down out of heaven, having the key to the Abyss and holding in his hand a great chain. 2He seized the dragon, that ancient serpent, who is the devil, or Satan, and bound him for a thousand years.

3He threw him into the Abyss, and locked and sealed it over him, to keep him from deceiving the nations anymore until the thousand years were ended. After that, he must be set free for a short time.