Exodus 9:8-12

6: Boils

8 Then the Lord said to Moses and Aaron, ‘Take in your hands some ashes from an oven. Throw them up in the air as Pharaoh watches. 9 They will become very small dust over the whole country of Egypt. The dust will cause boils to appear on the skin of people and animals. It will happen all over Egypt.’

10 So they took ashes from an oven and they stood in front of Pharaoh. Moses threw the ashes up in the air. Then bad boils appeared on both people and animals. 11 All the Egyptians had boils, even the magicians. Because of the boils, the magicians could not stand in front of Moses. 12 But Pharaoh refused to listen to Moses and Aaron. The Lord caused Pharaoh's mind to be hard. The Lord had told Moses that this would happen, and it did!