And he did not many mighty works there because of their unbelief.
And straightway the father of the child cried out, and said with tears, Lord, I believe; help thou mine unbelief.
Afterward he appeared unto the eleven as they sat at meat, and upbraided them with their unbelief and hardness of heart, because they believed not them which had seen him after he was risen.
Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing.
Who against hope believed in hope, that he might become the father of many nations; according to that which was spoken, So shall thy seed be.
And being not weak in faith, he considered not his own body now dead, when he was about an hundred years old, neither yet the deadness of Sara's womb:
He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God;
And being fully persuaded that, what he had promised, he was able also to perform.
And therefore it was imputed to him for righteousness.
So we see that they could not enter in because of unbelief.