Was cast (εβληθη). First aorist (prophetic, affective) passive indicative of βαλλω (verse 3).

Into the lake of fire…

And the devil that deceived them. See Barnes on Revelation 20:3, 8.

And the devil that deceived them . . .—Better, And the devil that deceives them, or was deceiving them, was cast into the lake…

The fifth last thing is the defeat of Satan. In v.3 the release of Satan after the Millennium was anticipated: “He must [GK 1256] be set free for a…

And the devil that deceived them
Both before death, in the present life, by tempting and drawing them into immoralit…

While this world lasts, Satan's power in it will not be completely destroyed, though it may be limited and lessened. No sooner is Satan let loose t…