Matteo 8:29

And, behold, they cried out, saying. What have we to do with Thee, Jesus, Thou Son of God? Art Thou come hither to torment us before the time?

Jesus, having come to destroy the works of the devil, to redeem men from his sinister influence, from his destructive power, 1 John 3:8, immediately commanded the evil spirits to leave the men, Luke 8:29. But they, speaking with the tongue of one of the demoniacs, pleaded with Him not to torment them.

Note: The devil knows the man Jesus to be the Son of God; the evil spirits recognize in Him the future Judge; they fear the last judgment with its condemnation. Even now hell is for them a place of torture, excruciating, incessant. But until the last day, and especially during the days preceding the final judgment, they have, in a measure, the power and the might to destroy and to torture God's creatures.

But even so they are excluded from blessed communion with God. On the Day of Judgment they will be condemned into the abyss of hell, to be chained there forever with fetters of darkness. So they plead not to be tortured before that time.