“Then the Magicians said vnto Pharaoh; This is the singer of God. And Pharaohs heart was hardned, and he hearkened not vnto them, as the Lord had said.”
1611 King James Version (KJV)
8:19 This is the finger of God - The power of God. The devil's agents, when God permitted them, could do great things; but when he laid an embargo upon them, they could do nothing. The magicians inability in this instance shewed whence they had their ability in the former instances, and that they had no power against Moses but what was given them from above. But Pharaoh's heart was hardened - By himself and the devil.