Pharaoh's Heart Was Harden - Exodus 7-9.

Exodus 7:3-5 And I will harden Pharaoh’s heart, and multiply My signs and My wonders in the land of Egypt. But Pharaoh will not heed you, so that I may lay My hand on Egypt and bring My armies and My people, the children of Israel, out of the land of Egypt by great judgments. And the Egyptians shall know that I am the Lord, when I stretch out My hand on Egypt and bring out the children of Israel from among them.”