Exodus 4:21 The LORD said to Moses, "When you go back to Egypt see that you perform before Pharaoh all the wonders which I have put in your power; but I will harden his heart so that he will not let the people go.

Exodus 7:3 "But I will harden Pharaoh's heart that I may multiply My signs and My wonders in the land of Egypt.

Exodus 7:5 "The Egyptians shall know that I am the LORD, when I stretch out My hand on Egypt and bring out the sons of Israel from their midst."

Exodus 14:17 "As for Me, behold, I will harden the hearts of the Egyptians so that they will go in after them; and I will be honored through Pharaoh and all his army, through his chariots and his horsemen.

Exodus 14:23 Then the Egyptians took up the pursuit, and all Pharaoh's horses, his chariots and his horsemen went in after them into the midst of the sea.

Exodus 14:25 He caused their chariot wheels to swerve, and He made them drive with difficulty; so the Egyptians said, "Let us flee from Israel, for the LORD is fighting for them against the Egyptians." (NASB ©1995)