Exodus 4:21 And the Lord said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go. 10 I MC VC

Exodus 8:15 But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the Lord had said. 10 I MC VC

Exodus 8:32 And Pharaoh hardened his heart at this time also, neither would he let the people go. 10 I MC VC

Exodus 9:34 And 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 I MC VC