19 By the wrath of the LORD Almighty the land will be scorched and the people will be fuel for the fire; they will not spare one another.

Read Isaiah 9:19 Using Other Translations

Through the wrath of the LORD of hosts is the land darkened, and the people shall be as the fuel of the fire: no man shall spare his brother.
Through the wrath of the LORD of hosts the land is scorched, and the people are like fuel for the fire; no one spares another.
The land will be blackened by the fury of the LORD of Heaven’s Armies. The people will be fuel for the fire, and no one will spare even his own brother.