Romans 9:18

So he has mercy on anyone he pleases, and hardens the heart of anyone he pleases.

John 12:40

"He has made their eyes blind and their minds dull, To keep them from seeing with their eyes, and understanding with their minds, And turning to me to be cured."

Romans 1:28

And just as they refused to recognize God any longer, God has abandoned them to unworthy impulses and indecent conduct.

Romans 11:8-10

The rest became callous; as the Scripture says, "God has thrown them into a state of spiritual insensibility, with eyes that cannot see and cars that cannot hear, that has lasted down to this day."

2 Corinthians 2:16

to the one, a deathly, deadly odor, to the other a vital, life-giving one. Who is qualified for this task? I am!

2 Thessalonians 2:10-12

and full of wicked deception for men who are going to destruction, because they refused to love the truth and be saved.

1 Peter 2:8

and "A stone to stumble over, and a rock to trip them up." They stumble over the message because they will not obey it; that is their destiny.

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 made their eyes blind and their minds dull, To keep them from seeing with their eyes, and understanding with their minds, And turning to me to be cured."
Romans 1:28
And just as they refused to recognize God any longer, God has abandoned them to unworthy impulses and indecent conduct.
Romans 9:18
So he has mercy on anyone he pleases, and hardens the heart of anyone he pleases.
Romans 11:8
The rest became callous; as the Scripture says, "God has thrown them into a state of spiritual insensibility, with eyes that cannot see and cars that cannot hear, that has lasted down to this day."
2 Corinthians 2:16
to the one, a deathly, deadly odor, to the other a vital, life-giving one. Who is qualified for this task? I am!
2 Thessalonians 2:10
and full of wicked deception for men who are going to destruction, because they refused to love the truth and be saved.
1 Peter 2:8
and "A stone to stumble over, and a rock to trip them up." They stumble over the message because they will not obey it; that is their destiny.