'Hardening' in the Bible
Even now I'm hardening the heart of the Egyptians so they'll go after the Israelis. Then I'll receive honor by means of Pharaoh and all his army, his chariots, and his horsemen.
In the hardening of dust into hardness, And clods cleave together?
O the happiness of a man fearing continually, And whoso is hardening his heart falleth into evil.
A man often reproved, hardening the neck, Is suddenly broken, and there is no healing.
And looking round upon them with anger, distressed at the hardening of their heart, he says to the man, Stretch out thy hand. And he stretched it out, and his hand was restored.
So that you will not be conceited, brothers, I do not want you to be unaware of this mystery: A partial hardening has come to Israel until the full number of the Gentiles has come in.
being darkened in their understanding, alienated from the life of God, because of the ignorance that is in them, because of the hardening of their heart;