Matthew 17:20
So he said to them, "Because of your little faith. For truly, I say to you, if you have faith as a grain of mustard seed, you will say to this mountain, 'Move from here to there,' and it will move; and nothing will be impossible to you."
Luke 17:6
So the Lord said, "If you have faith as a mustard seed, you can say to this mulberry tree, 'Be uprooted and be planted in the sea,' and it would obey you.
Matthew 13:31
Another parable he put forth to them, saying: "The kingdom of heaven is like a mustard seed, which a man took and sowed in his field;
Matthew 21:21
And Jesus answered them, "Truly, I say to you, if you have faith and do not doubt, you will not only do what was done to the fig tree, but even if you say to this mountain, 'Be taken up and cast into the sea,' it will be done.
Mark 11:23
Truly, I say to you, whoever says to this mountain, 'Be taken up and cast into the sea,' and does not doubt in his heart, but believes that what he says will come to pass, it will be done for him.
1 Corinthians 13:2
If I have the gift of prophecy, and understand all mysteries and all knowledge; and if I have all faith, so as to remove mountains, but have not love, I am nothing.
Mark 9:23
Jesus said to him, "If you can, all things are possible to him who believes."
Matthew 14:30-31
But when he saw the wind, he was afraid, and beginning to sink he cried out, "Lord, save me!"
Matthew 17:9
And as they were coming down the mountain, Jesus commanded them, "Tell no one the vision, until the Son of Man is raised from the dead."
Matthew 17:17
Then Jesus answered, "O faithless and perverse generation, how long shall I be with you? How long shall I bear with you? Bring him here to me."
Mark 4:31
It is like a mustard seed which, when it is sown on the ground, is the smallest of all seeds in the earth;
Luke 1:37
For with God nothing will be impossible."
Luke 18:27
But he said, "What is impossible with men is possible with God."
John 11:40
Jesus said to her, "Did I not tell you that if you would believe you would see the glory of God?"
1 Corinthians 12:9
to another faith by the same Spirit, to another gifts of healing by the one Spirit,
Hebrews 3:19
So we see that they were not able to enter because of unbelief.