By the wrath of the LORD of Hosts the land is scorched, and the people are fuel for the fire. No man even spares his brother.
19. Through the anger of the Lord of hosts is the land darkened. After having shown that the cause of all our evils proceeds from ourselves, and that therefore the blame of it should be laid upon us, he at the same time shows that God is a most righteous avenger.
Isa 9:18-21 Strophe 3. “For the wickedness burneth up like fire: it devours thorns and thistles, and burns in the thickets of the wood; and they smoke upwards in a lofty volume of smoke. Through the wrath of Jehovah of hosts the land is turned into coal, and the nation has become like the food of fire: not one spares his brother.
Commenting on Isaiah 9:18-21
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. (q) Though there was no foreign enemy, yet they will destroy one another.