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Snaff and Zojja peered back down into the rift and saw what Caithe meant: The lake of fire was boiling, yes, but not with gas bubbles.
Gases hissed in gray jets from the slopes of the island, and the lake of fire boiled.
And the Devil that deceived them was cast into a lake of fire and brimstone, where both  the Beast and the False Prophet are, and they shall be tormented day and night for ever and ever] Not now is Satan merely to be "bound."
“And this fight, coming up,” Rytlock said, “on a lake of fire beneath the ground against an army of magma creatures—against the dragon champion of Primordus?”
68 All these were only so many preparatory and alarming signs of the great catastrophe of Rome, when the country of the Scipios and Caesars should be consumed by a flame from Heaven, and the city of the seven hills, with her palaces, her temples, and her triumphal arches, should be buried in a vast lake of fire and brimstone.