Exodus 8:16-17

So the LORD said to Moses, “Say to Aaron, ‘Stretch out your rod, and strike the dust of the land, so that it may become lice throughout all the land of Egypt.’ ” And they did so. For Aaron stretched out his hand with his rod and struck the dust of the earth, and it became lice on man and beast. All the dust of the land became lice throughout all the land of Egypt.