TSK · Exodus 9:7

Pharaoh's heart was hardened, and he didn't listen to them; as Yahweh had spoken.

Pharaoh hardened his heart this time also, and he didn't let the people go.

God who is wise in heart, and mighty in strength: who has hardened himself against him, and prospered?

Because I knew that you are obstinate, and your neck is an iron sinew, and your brow brass;

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