God multiplying that dust, and heating it, and then dispersing it over all the land, and causing it to fall and rest upon the bodies of the Egyptians.
Related Commentaries of Exodus 9:10
Exodus 9:10
10 And they took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it up toward heaven; and it became a boil breaking forth with blains upon man, and upon beast.