John 12:40

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.

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

Then Yahweh said to Moses, “Come to Pharaoh, for I have hardened his heart and the heart of his servants with firmness, that I may set these signs of Mine among them,

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.

He said, “Go, and tell this people: ‘Keep on hearing, but do not understand; Keep on seeing, but do not know.’

‘Now hear this, O people who are simpleminded fools and without a heart of wisdom, Who have eyes but do not see, Who have ears but do not hear.

“Son of man, you live in the midst of the rebellious house, who have eyes to see but do not see, ears to hear but do not hear; for they are a rebellious house.

“And in them the prophecy of Isaiah is being fulfilled, which says, ‘You will keep on hearing, but will not understand; You will keep on seeing, but will not perceive;

so that while seeing, they may see and not perceive, and while hearing, they may hear and not understand, lest they return and be forgiven.”

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