Isaiah 9:18

The smouldering embers of wickedness burst out in a raging fire: see Hosea's image of the oven, Isaiah 7:4; Isaiah 7:6.

For wickedness … thickets Render, For wickedness burned like a fire that consumes thorns and thistles, and it set fire to the thickets, &c., cf. Isaiah 10:17-18. Both wickedness and the punishment of it are likened to an unquenchable fire; Job 31:12; Deuteronomy 32:22. First the thorns and thistles are kindled, then the fire catches the trees.

they shall mount … smoke and they roll upward in a pillar of smoke; lit. "a lifting up of smoke." The word for "roll upward" does not occur again; it contains an alliteration with that for "thickets."