Exodus 8:16-19

16So 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.’ ”

17And 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.

18Now the magicians so worked with their enchantments to bring forth lice, but they could not. So there were lice on man and beast.

19Then the magicians said to Pharaoh, “This is the finger of God.” But Pharaoh’s heart grew hard, and he did not heed them, just as the Lord had said.