For every trampling boot of battle and every garment rolled in blood will be burned as fuel for the fire.
Even in the darkest hour, God's people possess a nevertheless: they are troubled yet not forsaken, sorrowful yet always rejoicing. The God who forms light and creates darkness has set bounds to both; He can say to the dimness, Thus far you shall go and no further. This is our comfort when all grows black.
AI summary
Commenting on Isaiah 9:1-7
Isa 9:5 “For every boot of those who tramp with boots in the tumult of battle, and cloak rolled in blood, shall be for burning, a food of fire.” That which is the food of fire becomes at the same time a sĕrēphâh, inasmuch as the devouring fire reduces it to ashes, and destroys its previous existence.
For every battle of the warrior [is] with confused noise, and garments rolled in blood; but [this] shall be with burning [and] fuel of fire. (i) He speaks of the deliverance of his Church, which he has delivered miraculously from his enemies, but especially by the coming of Christ of whom he prophecies in the next verse.