'Hardened' in the Bible

for they had not gained any insight from the incident of the loaves, but their heart was hardened.

And Jesus, aware of this, *said to them, “Why do you discuss the fact that you have no bread? Do you not yet see or understand? Do you have a hardened heart?

“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.”

But when some were becoming hardened and disobedient, speaking evil of the Way before the people, he withdrew from them and took away the disciples, reasoning daily in the school of Tyrannus.

What then? What Israel is seeking, it has not obtained, but those who were chosen obtained it, and the rest were hardened;

But their minds were hardened; for until this very day at the reading of the old covenant the same veil remains unlifted, because it is removed in Christ.

But encourage one another day after day, as long as it is still called “Today,” so that none of you will be hardened by the deceitfulness of sin.