Exodus 8:16 Then the LORD said to Moses, "Say to Aaron, 'Stretch out your staff and strike the dust of the earth, that it may become gnats through all the land of Egypt.'"

Exodus 8:17 They did so; and Aaron stretched out his hand with his staff, and struck the dust of the earth, and there were gnats on man and beast. All the dust of the earth became gnats through all the land of Egypt.

Exodus 8:21 "For if you do not let My people go, behold, I will send swarms of insects on you and on your servants and on your people and into your houses; and the houses of the Egyptians will be full of swarms of insects, and also the ground on which they dwell. (NASB ©1995)