How can a spirit being like Satan be bound?
Satan is bound by God’s appointed means through an angel who comes down from heaven with the key of the bottomless pit and a great chain. The angel lays hold on the dragon, binds him for a thousand years, casts him into the pit, shuts it, and seals it so he cannot deceive the nations.
Les explains that this is the first time Scripture delineates a thousand-year period. The angel has the key of the bottomless pit and a great chain, and God knows what to use to bind a spirit being like Satan. He is bound for a thousand years, cast into the bottomless pit, shut up, and sealed so he should deceive the nations no more, as he had been doing for six thousand years, until the thousand years are fulfilled. Afterward he must be loosed for a little season, and then he goes out to deceive the nations in the four quarters of the earth.
And I saw an angel come down from heaven, having the key of the bottomless pit and a great chain in his hand.