Keluaran 9:12

9:12 But the Lord hardened ¹  Pharaoh’s heart, and he did not listen to them, just as the Lord had predicted to Moses.

Keluaran 10:20

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

[9:12]  ¹ tn This phrase translates the Hebrew word חָזַק (khazaq); see S. R. Driver, Exodus, 53.