Exodus 8:15-17

Amplified Bible

¹⁵ But when Pharaoh saw that there was [temporary] relief, he hardened his heart and would not listen or pay attention to them, just as the Lord had said.

The Plagues of Gnats and Insects

¹⁶ Then the Lord said to Moses, “Say to Aaron, ‘Stretch out your staff and strike the dust of the ground, and it will become [biting] gnats (lice) throughout the land of Egypt.’” ¹⁷ They did so; Aaron stretched out his hand with his staff and struck the dust of the earth, and there were [biting] gnats on man and animal. All the dust of the land became gnats through all the land of Egypt.