Exodus 9:8-12
The Sixth Blow: Boils
9:8 Then the Lord said to Moses and Aaron, “Take handfuls of soot from a furnace, and have Moses throw it into the air while Pharaoh is watching.
9:9 It will become fine dust over the whole land of Egypt and will cause boils to break out and fester on both people and animals in all the land of Egypt.”
9:10 So they took soot from a furnace and stood before Pharaoh, Moses threw it into the air, and it caused festering boils to break out on both people and animals.
9:11 The magicians could not stand before Moses because of the boils, for boils were on the magicians and on all the Egyptians.
9:12 But the Lord hardened Pharaoh’s heart, and he did not listen to them, just as the Lord had predicted to Moses.