'Hardness' in the Bible

He *said to them, “Because of your hardness of heart Moses permitted you to divorce your wives; but from the beginning it has not been this way.

After looking around at them with anger, grieved at their hardness of heart, He *said to the man, “Stretch out your hand.” And he stretched it out, and his hand was restored.

But Jesus said to them, “Because of your hardness of heart he wrote you this commandment.

Afterward He appeared to the eleven themselves as they were reclining at the table; and He reproached them for their unbelief and hardness of heart, because they had not believed those who had seen Him after He had risen.

being darkened in their understanding, excluded from the life of God because of the ignorance that is in them, because of the hardness of their heart;