Exodus 4:21

4:21 The Lord said to Moses, “When you go back to Egypt, see that you do before Pharaoh all the wonders I have put under your control. But I will harden his heart and he will not let the people go.

Exodus 7:13-14

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

The First Blow: Water to Blood

7:14 The Lord said to Moses, “Pharaoh’s heart is hard; he refuses to release the people.

Exodus 9:27

9:27 So Pharaoh sent and summoned Moses and Aaron and said to them, “I have sinned this time! The Lord is righteous, and I and my people are guilty.

Exodus 9:34-35

9:34 When Pharaoh saw that the rain and hail and thunder ceased, he sinned again: both he and his servants hardened their hearts. 9:35 So Pharaoh’s heart remained hard, and he did not release the Israelites, as the Lord had predicted through Moses.

Psalms 7:11

7:11 God is a just judge;

he is angry throughout the day.