Exodus 8:18-19
Exodus 8: 18 to 19
18 And the magicians did so with their enchantments to bring forth lice, but they could not: so there were lice on man, and on beast.
19 Then the magicians said to Pharaoh, This is the finger of God: and Pharaoh's heart was hardened, and he listened not to them; as the LORD had said.