Pharaoh was hardened # 02_EXO_09_07 # And Pharaoh sent, and, behold, there was not one of the cattle of the Israelites dead. And the heart of Pharaoh was hardened, and he did not let the people go. 
Pharaoh was hardened # 02_EXO_09_35 # And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the LORD had spoken by Moses.