“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.”
King James Version (KJV)
9:10 Ashes of the furnace - Sometimes God shews men their sin in their punishment: they had oppressed Israel in the furnaces, and now the ashes of the furnace are made as much a terror to them as ever their task - masters had been to the Israelites. This is afterwards called the botch of Egypt, #Deu 28:27|, as if it were some new disease, never heard of before, and known ever after by that name.