Pharaoh's heart was # 02_EXO_07_22 # And the magicians of Egypt did so with their enchantments: and Pharaoh's heart was hardened, neither did he hearken unto them; as the LORD had said. 
Pharaoh's heart was # 02_EXO_08_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 the LORD had said.