And He did not do many miracles there because of their unbelief.
Immediately the boy’s father cried out and said, “I do believe; help my unbelief.”
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.
Then He *said to Thomas, “Reach here with your finger, and see My hands; and reach here your hand and put it into My side; and do not be unbelieving, but believing.”
In hope against hope he believed, so that he might become a father of many nations according to that which had been spoken, “So shall your descendants be.”
Without becoming weak in faith he contemplated his own body, now as good as dead since he was about a hundred years old, and the deadness of Sarah’s womb;
yet, with respect to the promise of God, he did not waver in unbelief but grew strong in faith, giving glory to God,
and being fully assured that what God had promised, He was able also to perform.
Therefore it was also credited to him as righteousness.
So we see that they were not able to enter because of unbelief.