Romans 9:18

So He has mercy on any man that He chooses to, and He hardens any man that He chooses to harden.

John 12:40

"He has blinded their eyes and benumbed their hearts, so that they cannot see with their eyes and understand with their hearts, and turn to me to cure them."

Romans 1:28

And so, as they did not approve of fully recognizing God any longer, God gave them up to minds that He did not approve, to practices that were improper;

Romans 11:8-10

as the Scripture Says, "God has given them over to an attitude of insensibility, so that their eyes cannot see and their ears cannot hear, down to this very day."

2 Corinthians 2:16

to the one a deadly perfume that leads to death, to the other a living perfume that leads to life.

2 Thessalonians 2:10-12

and with a completely wicked deception for men who are on the way to destruction, because they refused to love the truth so as to be saved.

1 Peter 2:8

and: "A stone for them to stumble over and a rock to trip them up." They keep on stumbling over the message, because they are disobedient to it, and this is their appointed doom.

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 benumbed their hearts, so that they cannot see with their eyes and understand with their hearts, and turn to me to cure them."
Romans 1:28
And so, as they did not approve of fully recognizing God any longer, God gave them up to minds that He did not approve, to practices that were improper;
Romans 9:18
So He has mercy on any man that He chooses to, and He hardens any man that He chooses to harden.
Romans 11:8
as the Scripture Says, "God has given them over to an attitude of insensibility, so that their eyes cannot see and their ears cannot hear, down to this very day."
2 Corinthians 2:16
to the one a deadly perfume that leads to death, to the other a living perfume that leads to life.
2 Thessalonians 2:10
and with a completely wicked deception for men who are on the way to destruction, because they refused to love the truth so as to be saved.
1 Peter 2:8
and: "A stone for them to stumble over and a rock to trip them up." They keep on stumbling over the message, because they are disobedient to it, and this is their appointed doom.