Exodus 9:6-8

Living Bible

⁶ and it did. The next morning all the cattle of the Egyptians began dying, but not one of the Israeli herds was even sick. 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.