Exodus 9:6-9

6So the Lord did this thing on the next day, and 1all the livestock of Egypt died; 2but of the livestock of the sons of Israel, not one died. 7Pharaoh sent, and behold, there was not even one of the livestock of Israel dead. But 3the heart of Pharaoh was 4hardened, and he did not let the people go.

8Then the Lord said to Moses and Aaron, “Take for yourselves handfuls of soot from a kiln, and let Moses throw it toward the sky in the sight of Pharaoh. 9It will become fine dust over all the land of Egypt, and will become 5boils breaking out with sores on man and beast through all the land of Egypt.”