Bible Verses About Unbelief: Hardness of heart

Later, Yeshua appeared to the Eleven as they were eating, and he reproached them for their lack of trust and their spiritual insensitivity in not having believed those who had seen him after he had risen.

But some began hardening themselves and refusing to listen; and when these started defaming the Way before the whole synagogue, Sha’ul withdrew, took the talmidim with him, and commenced holding daily dialogues in Tyrannus’s yeshivah.