'Hardness of Heart' in the Bible

He said to them, Moses, on account of your hardness of heart, allowed you to put away your wives; but from the beginning it was not so.

And Jesus said to them, Because of your hardness of heart, he wrote you this ordinance;

And afterwards he appeared to the eleven, as they reclined, and reproached their unbelief and hardness of heart, because they believed not those who had seen him since he rose from the dead.