Exodus 9:7-9

Young's Literal Translation

⁷ and Pharaoh sendeth, and lo, not even one of the cattle of Israel hath died, and the heart of Pharaoh is hard, and he hath not sent the people away.

⁸ And Jehovah saith unto Moses and unto Aaron, `Take to you the fulness of your hands [of] soot of a furnace, and Moses hath sprinkled it towards the heavens, before the eyes of Pharaoh,

⁹ and it hath become small dust over all the land of Egypt, and it hath become on man and on cattle a boil breaking forth [with] blains, in all the land of Egypt.'