'Hardness of Heart' in the Bible

He said to them, "Moses, with reference to your hardness of heart, permitted you to divorce your wives, but from the beginning it was not like this.

But Jesus said to them, "He wrote this commandment for you because of your hardness of heart.

And later, [while] they were reclining at table, he appeared to the eleven. And he reprimanded their unbelief and hardness of heart, because they did not believe those who had seen him [after he] had been raised.