TSK · Exodus 10:20

I know that the king of Egypt won't give you permission to go, no, not by a mighty hand.

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

Yahweh said to Moses, "Go in to Pharaoh, for I have hardened his heart, and the heart of his servants, that I may show these my signs in the midst of them,

Moses and Aaron did all these wonders before Pharaoh, and Yahweh hardened Pharaoh's heart, and he didn't let the children of Israel go out of his land.

He said, "Go, and tell this people, 'You hear indeed, but don't understand; and you see indeed, but don't perceive.'

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