TSK · Exodus 9:7

And he hardened Pharaoh's heart, that he hearkened not unto them; as the LORD had said.

And Pharaoh hardened his heart at this time also, neither would he let the people go.

[He is] wise in heart, and mighty in strength: who hath hardened [himself] against him, and hath prospered?

Because I knew that thou [art] obstinate, and thy neck [is] an iron sinew, and thy brow brass;

Therefore hath he mercy on whom he will [have mercy], and whom he will he hardeneth.