Exodus 8:16-19

16Then the Lord said to Moses, “Tell Aaron: Stretch out your staff and strike the dust of the land, and it will become gnats throughout the land of Egypt.”

17And they did this. Aaron stretched out his hand with his staff, and when he struck the dust of the land, gnats were on people and animals. All the dust of the land became gnats throughout the land of Egypt.

18The magicians tried to produce gnats using their occult practices, but they could not. The gnats remained on people and animals.

19“This is the finger of God,” the magicians said to Pharaoh. But Pharaoh’s heart was hard, and he would not listen to them, as the Lord had said.