I [John] saw an angel coming down from heaven, holding the key to the bottomless pit and a large chain in his hand. He overpowered the serpent, that ancient snake, named Devil and Satan. 

    The angel chained up the serpent for 1,000 years. He threw it into the bottomless pit. The angel shut and sealed the pit over the serpent to keep it from deceiving the nations anymore until the 1,000 years were over. After that it must be set free for a little while.