Matthew 17:20
He told them, "Because of your lack of faith. I tell all of you with certainty, if you have faith like a grain of mustard seed, you can say to this mountain, "Move from here to there,' and it will move, and nothing will be impossible for you.
Luke 17:6
The Lord replied, "If you have faith the size of a mustard seed, you could say to this mulberry tree, "Be uprooted and planted in the sea,' and it would obey you!
Matthew 13:31
He presented another parable to them, saying, "The kingdom from heaven is like a mustard seed that a man took and planted in his field.
Matthew 21:21
Jesus answered them, "I tell all of you with certainty, if you have faith and do not doubt, not only will you be able to do what has been done to the fig tree, but you will also say to this mountain, "Be removed and thrown into the sea,' and it will happen.
Mark 11:23
I tell all of you with certainty, if anyone says to this mountain, "Be lifted up and thrown into the sea,' if he doesn't doubt in his heart but believes that what he says will happen, it will be done for him.
1 Corinthians 13:2
If I have the gift of prophecy and can understand all secrets and every form of knowledge, and if I have absolute faith so as to move mountains but have no love, I am nothing.
Mark 9:23
Jesus told him, ""If you are able?' Everything is possible for the person who believes!"
Matthew 14:30-31
But when he noticed the strong wind, he was frightened. As he began to sink, he shouted, "Lord, save me!"
Matthew 17:9
On their way down the mountain, Jesus ordered them, "Don't tell anyone about this vision until the Son of Man has been raised from the dead."
Matthew 17:17
Jesus replied, "You unbelieving and perverted generation! How long must I be with you? How long must I put up with you? Bring him here to me!"
Mark 4:31
It's like a mustard seed planted in the ground. Although it's the smallest of all the seeds on earth,
Luke 1:37
Nothing is impossible with respect to any of God's promises."
Luke 18:27
Jesus replied, "The things that are impossible for people are possible for God."
John 11:40
Jesus told her, "I told you that if you believed you would see God's glory, didn't I?"
1 Corinthians 12:9
to another faith by the same Spirit; to another gifts of healing by that one Spirit;
Hebrews 3:19
So we see that they were unable to enter because of their unbelief.