'Harden' in the Bible

And Jehovah said unto Moses, When thou goest back into Egypt, see that thou do before Pharaoh all the wonders which I have put in thy hand: but I will harden his heart and he will not let the people go.

And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt.

And I will harden Pharaoh's heart, and he shall follow after them; and I will get me honor upon Pharaoh, and upon all his host: and the Egyptians shall know that I am Jehovah. And they did so.

And I, behold, I will harden the hearts of the Egyptians, and they shall go in after them: and I will get me honor upon Pharaoh, and upon all his host, upon his chariots, and upon his horsemen.