Exodus 8:12-16

Then Moses and Aaron went out from Pharaoh, and Moses cried out to the Lord concerning the frogs which He had inflicted upon Pharaoh.

The Lord did according to the word of Moses, and the frogs died out of the houses, the courtyards, and the fields.

So they piled them in heaps, and the land stank.

But when Pharaoh saw that there was relief, he hardened his heart and did not listen to them, just as the Lord had said. The Plague of Insects

Then the Lord said to Moses, “Say to Aaron, ‘Extend your staff and strike the dust of the earth, so that it may turn into gnats through all the land of Egypt.’ ”