Adonai said to Moses, “When you go back to Egypt, see that you do all the wonders before Pharaoh that I have put in your hand. Still, I will harden his heart, and he will not let the people go.
So Adonai said to Moses, “Tell Aaron, ‘Stretch out your staff and strike the dust of the earth, and it will become gnats throughout all the land of Egypt.’”
So they did. When Aaron stretched out his hand with his staff and struck the dust of the earth, there were gnats on men and animals. All the dust of the earth became gnats throughout all the land of Egypt.