'Hardness of Heart' in the Bible

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

And Jesus said to them, On account of your hardness of heart he wrote you this command.

Afterward he manifested himself to the eleven themselves, as they were reclining at table, and upbraided them with their unbelief and hardness of heart, because they did not believe those who had seen him after he had risen.