Revelation 20:3

And cast him into the bottomless pit... — Rather, and cast him into the abyss (same word as in Revelation 20:1), and locked and sealed (the door or mouth) above him, that he may not deceive the nations any more until the thousand years shall have been finished; after these things he must be loosed for a little time. The sealing reminds us of the sealing employed when the wicked one had power through man’s agency to imprison God’s messengers. (Comp. Daniel 6:17, and Matthew 27:66.) Of the exact moment when this binding and imprisoning took place it is not needful to inquire too curiously. That which in the vision is described as the work of ä moment may in the fact and fulfilment be a very gradual work; or rather, the full manifestation of its accomplishment may be only gradually made clear. To fix it therefore, to any incident (for example, as Hengstenberg is disposed to do to the coronation of Charlemagne), is to fall into the “vicious realism” against which he rightly protests. The same applies to the duration of the imprisonment; it is not to be understood literally any more than the other numbers in the book; it symbolises a lengthened period. This period is followed by the loosing again of the devil for a short time. (See Note on Revelation 20:7.)