The Lord said to Moses: On your return to Egypt, see that you perform before Pharaoh all the wonders I have put in your power. But I will harden his heart and he will not let the people go.
Thereupon the Lord spoke to Moses: Speak to Aaron: Stretch out your staff and strike the dust of the earth, and it will turn into gnats throughout the land of Egypt.
They did so. Aaron stretched out his hand with his staff and struck the dust of the earth, and gnats came upon human being and beast alike. All the dust of the earth turned into gnats throughout the land of Egypt.