Revelation 20:10

Then God, perhaps using an unnamed agent, will cast Satan, the deceiver, into the lake of fire that He previously prepared for the devil and his angels (Matthew 25:41). The fact that the beast and the false prophet are still there shows that this is a place of conscious torment, not annihilation (Revelation 19:20). The Gog of the former invasion of Palestine (Revelation 19:17-21) is the beast. Furthermore the lake of fire is a place of eternal judgment: "day and night forever and ever." This will be Satan’s final abode, and this judgment will constitute the ultimate bruising of his head (cf. Genesis 3:15; John 12:31).

"It is hard for humans to conceive of how literal fire can bring torture to nonphysical beings, but the reality of unbearable pain inflicted on Satan is unquestionable. However the Bible may speak of that future punishment-whether as the lake of fire, outer darkness (Matthew 8:12; Matthew 22:13; Matthew 25:30), wailing and gnashing of teeth (Matthew 8:12; Matthew 13:42; Matthew 13:50; Matthew 22:13; Matthew 24:51; Matthew 25:30; Luke 13:28), a never-dying worm and unquenchable fire (Mark 9:48), or fire and brimstone-it presents a picture of mental agony and corporeal suffering combined in proportion to the guilt of those who have sinned (Luke 12:47-48) . . ." [Note: Thomas, Revelation 8-22, p. 426.]