Exodus 8:13-17

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.’ ”

They did so; and Aaron extended his hand with his staff and struck the dust of the earth, and there were gnats on every person and animal. All the dust of the earth turned into gnats through all the land of Egypt.