Exodus 9:6-9

6So on the next day, the Lord did it! All the animals of the Egyptians died. But not one of the animals of the Israelites died.

7Pharaoh sent his men to see what had happened. They saw that not one of the animals of the Israelites was dead! But Pharaoh's mind was still hard. He did not let the people go.

8Then the Lord said to Moses and Aaron, ‘Take in your hands some ashes from an oven. Throw them up in the air as Pharaoh watches.

9They will become very small dust over the whole country of Egypt. The dust will cause boils to appear on the skin of people and animals. It will happen all over Egypt.’