Exodus 8:15

8:15 But when Pharaoh saw that there was relief, he hardened his heart and did not listen to them, just as the Lord had predicted.

Exodus 9:12

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

Exodus 9:35

9:35 So Pharaoh’s heart remained hard, and he did not release the Israelites, as the Lord had predicted through Moses.