God said to Moses, "Tell Aaron, 'Take your staff and strike the dust. The dust will turn into gnats all over Egypt.'"
He did it. Aaron grabbed his staff and struck the dust of the Earth; it turned into gnats, gnats all over people and animals. All the dust of the Earth turned into gnats, gnats everywhere in Egypt.
The magicians tried to produce gnats with their incantations but this time they couldn't do it. There were gnats everywhere, all over people and animals.
The magicians said to Pharaoh, "This is God's doing." But Pharaoh was stubborn and wouldn't listen. Just as God had said. Strike Four: Flies