'Hardened' in the Bible

for they hadn't understood about the loaves, but their hearts were hardened.

Jesus, perceiving it, said to them, "Why do you reason that it's because you have no bread? Don't you perceive yet, neither understand? Is your heart still hardened?

"He has blinded their eyes and he hardened their heart, lest they should see with their eyes, and perceive with their heart, and would turn, and I would heal them."

But when some were hardened and disobedient, speaking evil of the Way before the multitude, he departed from them, and separated the disciples, reasoning daily in the school of Tyrannus.

What then? That which Israel seeks for, that he didn't obtain, but the chosen ones 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, because in Christ it passes away.

but exhort one another day by day, so long as it is called "today;" lest any one of you be hardened by the deceitfulness of sin.