Exodus 4:21 The LORD said to Moses, "When you go back to Egypt see that you perform before Pharaoh all the wonders which I have put in your power; but I will harden his heart so that he will not let the people go.

Exodus 7:3 "But I will harden Pharaoh's heart that I may multiply My signs and My wonders in the land of Egypt.

Exodus 9:12 And the LORD hardened Pharaoh's heart, and he did not listen to them, just as the LORD had spoken to Moses.

Exodus 10:20 But the LORD hardened Pharaoh's heart, and he did not let the sons of Israel go.

Exodus 10:27 But the LORD hardened Pharaoh's heart, and he was not willing to let them go.

Joshua 11:20 For it was of the LORD to harden their hearts, to meet Israel in battle in order that he might utterly destroy them, that they might receive no mercy, but that he might destroy them, just as the LORD had commanded Moses.

Isaiah 63:17 Why, O LORD, do You cause us to stray from Your ways And harden our heart from fearing You? Return for the sake of Your servants, the tribes of Your heritage.

John 12:40 "HE HAS BLINDED THEIR EYES AND HE HARDENED THEIR HEART, SO THAT THEY WOULD NOT SEE WITH THEIR EYES AND PERCEIVE WITH THEIR HEART, AND BE CONVERTED AND I HEAL THEM." (NASB ©1995)