Why do you make your hearts hard, like the hearts of Pharaoh and the Egyptians? When he had made sport of them, did they not let the people go, and they went away?
Then Moses and Aaron went in to Pharaoh, and said to him, This is what the Lord, the God of the Hebrews, says: How long will you be lifted up in your pride before me? let my people go so that they may give me worship.
And I will make the heart of the Egyptians hard, and they will go in after them: and I will be honoured over Pharaoh and over his army, his war-carriages, and his horsemen.
And the Lord said to Moses, When you go back to Egypt, see that you do before Pharaoh all the wonders which I have given you power to do: but I will make his heart hard and he will not let the people go.