Exodus 7:13

7:13 Yet Pharaoh’s heart became hard, ¹  and he did not listen to them, just as the Lord had predicted.

Exodus 10:20

10:20 But the Lord hardened Pharaoh’s heart, and he did not release the Israelites.

[7:13]  ¹ tn This phrase translates the Hebrew word חָזַק (khazaq); see S. R. Driver, Exodus, 53.