Exodus 9:7-9

Living Bible

⁷ Pharaoh sent to see whether it was true that none of the Israeli cattle were dead, yet when he found out that it was so, even then his mind remained unchanged and he refused to let the people go.

⁸ Then Jehovah said to Moses and Aaron, “Take ashes from the kiln and have Moses toss them into the sky as Pharaoh watches. ⁹ They will spread like fine dust over all the land of Egypt and cause boils to break out upon people and animals alike, throughout the land.”