Revelation 14:10-11 and 20:10 seem to be some of the strongest verses in the Bible supporting the idea that the wicked will be tormented for eternity. Their language seems to be quite clear, "The smoke of their torment goes up forever and ever." Hell is Made Holy demonstrates that this language is very likely intentionally borrowed from the symbolism of the endlessly rising smoke of the Old Testament sacrificial system where it has nothing to do with end...

Jeremiah 31:40 The whole valley of the dead bodies and of the ashes, and all the fields to the brook Kidron, to the corner of the horse gate toward the east, will be holy to Yahweh. It will not be plucked up or thrown down any more forever.”