Exodus 9:9-11

Complete Jewish Bible

⁹ They will turn into fine dust over all the land of Egypt and become infected sores on men and animals throughout Egypt.” ¹⁰ So they took ashes from a kiln, stood in front of Pharaoh and threw them in the air; and they became infected sores on men and animals. ¹¹ The magicians couldn’t even stand in Moshe’s presence because of the sores, which were on them as well as on the other Egyptians.