Exodus 8:16-19

16The Lord said to Moses, “Tell Aaron, ‘Extend your staff and strike the dust of the ground, and it will become gnats throughout all the land of Egypt.’”

17They did so; Aaron extended his hand with his staff, he struck the dust of the ground, and it became gnats on people and on animals. All the dust of the ground became gnats throughout all the land of Egypt.

18When the magicians attempted to bring forth gnats by their secret arts, they could not. So there were gnats on people and on animals.

19The magicians said to Pharaoh, “It is the finger of God!” But Pharaoh’s heart remained hard, and he did not listen to them, just as the Lord had predicted.