[Exodus 4:21] And the LORD said to Moses, “When you go back to Egypt, see that you do all those wonders before Pharaoh which I have put in your hand. But I will harden his heart, so that he will not let the people go.

[Exodus 7:3-5] 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.”

[Deuteronomy 32:30] But Sihon king of Heshbon would not let us pass through, for the LORD your God hardened his spirit and made his heart obstinate, that He might deliver him into your hand, as it is this day.