And he did not do many miracles there because of their lack of faith.
Immediately the boy’s father exclaimed, “I do believe; help me overcome my unbelief!”
Later Jesus appeared to the Eleven as they were eating; he rebuked them for their lack of faith and their stubborn refusal to believe those who had seen him after he had risen.
Then he said to Thomas, “Put your finger here; see my hands. Reach out your hand and put it into my side. Stop doubting and believe.”
Against all hope, Abraham in hope believed and so became the father of many nations, just as it had been said to him, “So shall your offspring be.”
Without weakening in his faith, he faced the fact that his body was as good as dead—since he was about a hundred years old—and that Sarah’s womb was also dead.
Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God,
being fully persuaded that God had power to do what he had promised.
This is why “it was credited to him as righteousness.”
So we see that they were not able to enter, because of their unbelief.