So the heart of Pharaoh was hardened, and he would not let the Israelites go, just as the Lord had spoken through Moses.
I know, however, that the king of Egypt will not let you go except by a mighty hand.
And the Lord said to Moses, “When you go back to Egypt, see that you perform before Pharaoh all the wonders that I have put in your power, but I will harden his heart, so that he will not let the people go.
However, Pharaoh’s heart was hardened, and he would not listen to them, as the Lord had said.
But when Pharaoh saw that the rain and the hail and the thunder had ceased, he sinned once more and hardened his heart, he and his officials.