Revelation 20:1-3

I saw an angel coming down from heaven. He had the key to the bottomless pit and a large chain in his hand. The angel grabbed the dragon, that old snake who is the devil and Satan, and tied him up for a thousand years. Then he threw him into the bottomless pit, closed it, and locked it over him. The angel did this so he could not trick the people of the earth anymore until the thousand years were ended. After a thousand years he must be set free for a short time.