Romans 9:18

Therefore he has mercy on whom he wills, and he hardens the heart of whom he wills.

John 12:40

"He has blinded their eyes and hardened their hearts, lest they should see with their eyes, and understand with their hearts and turn, so that I should heal them."

Romans 1:28

And since they did not see fit to retain the knowledge of God, God gave them over to a base mind, to do what ought not to be done.

Romans 11:8-10

as it is written: "God gave them a spirit of stupor, eyes that they should not see and ears that they should not hear, down to this very day."

2 Corinthians 2:16

to the one a fragrance from death to death, to the other a fragrance from life to life. And who is sufficient for these things?

2 Thessalonians 2:10-12

and with all the deception of wickedness for those who are to perish, because they refused to love the truth and so be saved.

1 Peter 2:8

and, "A stone that causes men to stumble and a rock that makes them fall;" they stumble because they disobey the wordas they were desstined to do.

Treasury of Scripture Knowledge

Summary

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.

Bible References

I will harden

John 12:40
"He has blinded their eyes and hardened their hearts, lest they should see with their eyes, and understand with their hearts and turn, so that I should heal them."
Romans 1:28
And since they did not see fit to retain the knowledge of God, God gave them over to a base mind, to do what ought not to be done.
Romans 9:18
Therefore he has mercy on whom he wills, and he hardens the heart of whom he wills.
Romans 11:8
as it is written: "God gave them a spirit of stupor, eyes that they should not see and ears that they should not hear, down to this very day."
2 Corinthians 2:16
to the one a fragrance from death to death, to the other a fragrance from life to life. And who is sufficient for these things?
2 Thessalonians 2:10
and with all the deception of wickedness for those who are to perish, because they refused to love the truth and so be saved.
1 Peter 2:8
and, "A stone that causes men to stumble and a rock that makes them fall;" they stumble because they disobey the wordas they were desstined to do.