'Unbelief' in the Bible
He didn't do many mighty works there because of their unbelief.
He said to them, "Because of your unbelief. For most certainly I tell you, if you have faith as a grain of mustard seed, you will tell this mountain, 'Move from here to there,' and it will move; and nothing will be impossible for you.
He marveled because of their unbelief. He went around the villages teaching.
Immediately the father of the child cried out with tears, "I believe. Help my unbelief!"
Afterward he was revealed to the eleven themselves as they sat at the table, and he rebuked them for their unbelief and hardness of heart, because they didn't believe those who had seen him after he had risen.
Yet, looking to the promise of God, he didn't waver through unbelief, but grew strong through faith, giving glory to God,
True; by their unbelief they were broken off, and you stand by your faith. Don't be conceited, but fear;
They also, if they don't continue in their unbelief, will be grafted in, for God is able to graft them in again.
although I was before a blasphemer, a persecutor, and insolent. However, I obtained mercy, because I did it ignorantly in unbelief.
Beware, brothers, lest perhaps there be in any one of you an evil heart of unbelief, in falling away from the living God;
We see that they were not able to enter in because of unbelief.