Revelation 20:1-3

New International Version - UK

The thousand years

20 And I saw an angel coming down out of heaven, having the key to the Abyss and holding in his hand a great chain. ² He seized the dragon, that ancient snake, who is the devil, or Satan, and bound him for a thousand years. ³ He threw him into the Abyss, and locked and sealed it over him, to keep him from deceiving the nations any more until the thousand years were ended. After that, he must be set free for a short time.