Wherefore then do ye harden your hearts, as the Egyptians and Pharaoh hardened their hearts? when he had wrought wonderfully among them, did they not let the people go and they departed?
And I, behold, I will harden the hearts of the Egyptians, and they shall go in after them: and I will get me honour upon Pharaoh, and upon all his host, upon his chariots, and upon his horsemen.
And Moses and Aaron went in unto Pharaoh, and said unto him, Thus saith the LORD, the God of the Hebrews, How long wilt thou refuse to humble thyself before me? let my people go, that they may serve me.
And the LORD said unto Moses, When thou goest back into Egypt, see that thou do before Pharaoh all the wonders which I have put in thine hand: but I will harden his heart, and he will not let the people go.