'Harden' in the Bible

Then the LORD told Moses, "When you set out to return to Egypt, keep in mind all the wonders that I've put in your power, so that you may do them before Pharaoh. But I'll harden his heart so that he won't let the people go.

I'll harden Pharaoh's heart and I'll add more and more of my signs and wonders in the land of Egypt.