Rev 20:3

3 and cast him into the abyss, and shut it, and sealed it over him, that he should deceive the nations no more, until the thousand years were finished. After this, he must be freed for a short time. 

and threw him into the abyss – this is not the lake of fire, but a holding place. The 6,000 demons who were cast out of the man in Luke 8:31, begged Jesus not to send them into the abyss, or “bottomless pit” – Rev 9:1

he would not deceive the nations any longer – the 1,000 year period that followed the Reformation is the undoing of Satan’s deceptions.

he must be released for a short time – after the truth is restored, and kingdom of heaven is cleansed, Satan will be released to deceive the world again.