4:21And 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.

7:3And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt.

7:13And he hardened Pharaoh's heart, that he hearkened not unto them; as the LORD had said.

7:22And 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.

8:15But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the LORD had said.

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

9:12And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses.