'Unbelief' in the Bible

But Jesus told them, "A prophet is without honor only in his hometown and in his own home." He did not perform many miracles there because of their unbelief.

He was amazed at their unbelief. Then he went around to the villages and continued teaching.

With tears flowing, the child's father at once cried out, "I do believe! Help my unbelief!"

Finally he appeared to his eleven disciples while they were eating. He rebuked them for their unbelief and stubbornness, because they had not believed those who had seen him after he had risen.

That's right! They were broken off because of their unbelief, but you remain only because of faith. Do not be arrogant, but be afraid!

If the Jews do not persist in their unbelief, they will be grafted in again, because God is able to graft them in.

In the past I was a blasphemer, a persecutor, and a violent man. But I received mercy because I acted ignorantly in my unbelief,

So we see that they were unable to enter because of their unbelief.