Exodus 9:6-9

6The Lord did this the next day. All the Egyptian livestock died, but none among the Israelite livestock died.

7Pharaoh sent messengers who saw that not a single one of the Israelite livestock was dead. But Pharaoh’s heart was hard, and he did not let the people go.

8Then the Lord said to Moses and Aaron, “Take handfuls of furnace soot, and Moses is to throw it toward heaven in the sight of Pharaoh.

9It will become fine dust over the entire land of Egypt. It will become festering boils on people and animals throughout the land of Egypt.”