Bible Verses About Unbelief: Hardness of heart

At length he appeared to the eleven as they were at table: and he upbraided them with their incredulity and hardness of heart, because they did not believe them who had seen him after he was risen again.

But when some were hardened and believed not, speaking evil of the way of the Lord before the multitude, departing from them, he separated the disciples, disputing daily in the school of one Tyrannus.