Why should you harden your hearts as the Egyptians and Pharaoh hardened their hearts? After he had made sport of them, did not they let the people go, and they departed?
So Moses and Aaron went in to Pharaoh, and said to him, “Thus says the Lord, the 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 will harden the hearts of the Egyptians so that they shall go in after them, and I will get glory over Pharaoh and all his host, his chariots, and his horsemen.
And the Lord said to Moses, “When you go back to Egypt, see that you do before Pharaoh all the miracles which I have put in your power; but I will harden his heart, so that he will not let the people go.