Exodus 3:19 ¶And I am sure that the king of Egypt will not let you go, no, not by a mighty hand.

Exodus 4:21 And the LORD said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go.

Exodus 10:20 But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go.

Revelation 9:20 And the rest of the men which were not killed by these plagues yet repented not of the works of their hands, that they should not worship devils, and idols of gold, and silver, and brass, and stone, and of wood: which neither can see, nor hear, nor walk:

Revelation 16:10 And the fifth angel poured out his vial upon the seat of the beast; and his kingdom was full of darkness; and they gnawed their tongues for pain,

Revelation 16:11 And blasphemed the God of heaven because of their pains and their sores, and repented not of their deeds.