(Mat 25:41) “Then he will say to those on his left, ‘Depart from me, you who are cursed, into the eternal fire prepared for the devil and his angels.”
(Rev 20:10) And the devil, who deceived them, was thrown into the lake of burning sulfur, where the beast and the false prophet had been thrown. They will be tormented day and night for ever and ever.
Many commentators find in Rev 20:10 justification for the idea that lost humans will be tormented for ever and ever, but the passage simply doesn’t say that. In fact, the clear implication is that the devil’s human followers will be killed.
Evidently, as Jesus says, the Lake of Fire was prepared for the devil, not for humans. I make no claim to know the history of the devil, but it’s hardly surprising that the fate of the devil and the fate of those humans who follow him would be different. After all, the devil and his angels are an entirely different kind of being, created for quite different purposes, in rebellion with very different knowledge of God.
And if the fire was designed for spiritual beings, it only makes sense that the resurrected bodies of the lost would be destroyed, whereas the devil and his angels, being made of different stuff, aren’t.
Of course, I understand that there’s a large amount of metaphor in all this. These are pictures to give us a glimpse of something far beyond our experience or understanding. Nonetheless, the scriptures are in remarkable accord, and the pictures the Spirit paints for us through the inspired scriptures merit study. But we have no business expecting a complete understanding. That will come later.