9:27And Pharaoh sent, and called for Moses and Aaron, and said unto them, I have sinned this time: the LORD is righteous, and I and my people are wicked.

9:34And when Pharaoh saw that the rain and the hail and the thunders were ceased, he sinned yet more, and hardened his heart, he and his servants.

10:16Then Pharaoh called for Moses and Aaron in haste; and he said, I have sinned against the LORD your God, and against you.

10:20But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go.