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.

Psalms 81:11-12

81:11 But my people did not obey me;

Israel did not submit to me.

81:12 I gave them over to their stubborn desires;

they did what seemed right to them.

Revelation 16:10-11

16:10 Then the fifth angel poured out his bowl on the throne of the beast so that darkness covered his kingdom, and people began to bite their tongues because of their pain. 16:11 They blasphemed the God of heaven because of their sufferings and because of their sores, but nevertheless they still refused to repent of their deeds.