Why then do you harden your hearts, as the Egyptians and Pharaoh hardened their hearts? when he had worked wonderfully among them, did they not let the people go, and they departed?
And Moses and Aaron came in to Pharaoh, and said to him, Thus said the LORD God of the Hebrews, How long will you refuse to humble yourself before me? let my people go, that they may serve me.
And I, behold, I will harden the hearts of the Egyptians, and they shall follow them: and I will get me honor on Pharaoh, and on all his host, on his chariots, and on his horsemen.
And the LORD said to Moses, When you go to return into Egypt, see that you do all those wonders before Pharaoh, which I have put in your hand: but I will harden his heart, that he shall not let the people go.