Êxodo 8:19

19 the magicians said to Pharaoh, "This is the finger of God." But Pharaoh's heart was hard and he would not listen, just as the Lord had said.

19 Then the magicians said unto Pharaoh, This is the finger of God: and Pharaoh's heart was hardened, and he hearkened not unto them; as Jehovah had spoken.