Exodus 9:8-12

⁸Then the Lord said to Moses and Aaron, “Take for yourselves handfuls of soot from a kiln, and let Moses throw it toward the sky in the sight of Pharaoh. ⁹It will become fine dust over all the land of Egypt, and will become boils breaking out with sores on man and beast through all the land of Egypt.” ¹⁰So they took soot from a kiln, and stood before Pharaoh; and Moses threw it toward the sky, and it became boils breaking out with sores on man and beast. ¹¹The magicians could not stand before Moses because of the boils, for the boils were on the magicians as well as on all the Egyptians. ¹²And the Lord hardened Pharaoh’s heart, and he did not listen to them, just as the Lord had spoken to Moses.