Exodus 7:3

“So I will stretch out My hand and strike Egypt with all My wondrous deeds which I shall do in the midst of it; and after that he will let you go.

And Yahweh said to Moses, “When you go to return to Egypt, see to it that all the miraculous wonders which I have put in your hand, that you do them before Pharaoh; but as for Me, I will harden his heart with strength so that he will not let the people go.

Yet Pharaoh’s heart was hardened with strength, and he did not listen to them, as Yahweh had spoken.

Then Yahweh said to Moses, “Pharaoh will not listen to you, so that My miraculous wonders will be multiplied in the land of Egypt.”

Now Moses and Aaron did all these miraculous wonders before Pharaoh; yet Yahweh hardened Pharaoh’s heart with strength, and he did not let the sons of Israel go out of his land.

“Thus I will harden Pharaoh’s heart with strength, and he will pursue them; and I will be glorified through Pharaoh and all his army, so that the Egyptians will know that I am Yahweh.” And they did so.

When He performed His signs in Egypt And His miracles in the field of Zoan,

“This man led them out, doing wonders and signs in the land of Egypt and in the Red Sea and in the wilderness for forty years.

So then He has mercy on whom He desires, and He hardens whom He desires.