Exodus 9:8-10

Darby Translation

⁸ And Jehovah said to Moses and to Aaron, Take to yourselves handfuls of ashes of the furnace, and let Moses scatter it toward the heavens before the eyes of Pharaoh.

⁹ And it shall become fine dust over all the land of Egypt, and shall become boils on man and on cattle, breaking out [with] blisters, throughout the land of Egypt.

¹⁰ And they took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it toward the heavens; and it became boils [with] blisters breaking out on man and on cattle.