Matthew 17:20
And he said to them, Because of your want of faith. For truly do I say to you, If ye have faith as a grain of mustard, ye shall say to this mountain, Remove hence to yonder place, and it will remove; and nothing will be impossible to you.
Luke 17:6
But the Lord said, If ye had faith as a grain of mustard, ye might say to this sycaminetree, Be plucked up by the roots, and 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 grain of mustard, which a man took and sowed in his field.
Matthew 21:21
Jesus answering said to them, Truly do I say to you, If ye have faith, and do not doubt, not only shall ye do what hath been done to the figtree, but should ye even say to this mountain, Be thou taken up and cast into the sea, it would be done.
Mark 11:23
Truly do I say to you, that whoever shall say to this mountain, Be thou taken up, and cast into the sea, and shall not doubt in his heart, but shall believe that what he saith will come to pass, he shall have it.
1 Corinthians 13:2
And though I have the gift of prophecy, and understand all mysteries and all knowledge, and though I have all faith, so as to remove mountains, and have not love, I am nothing.
Mark 9:23
Jesus said to him, If thou art able? All things are possible for him that believeth.
Matthew 14:30-31
But seeing the wind, he was afraid; and beginning to sink, he cried out, saying, Lord, save me!
Matthew 17:9
And as they came down from the mountain, Jesus charged them, saying, Tell what hath been seen to no one, until the Son of man hath risen from the dead.
Matthew 17:17
Then Jesus answering said, Unbelieving and perverse generation! How long shall I be with you? How long shall I bear with you? Bring him hither to me.
Mark 4:31
It is like a grain of mustard, which, when it is sown in the earth, is less than all the seeds that are in the earth;
Luke 1:37
For nothing will be impossible with God.
Luke 18:27
But he said, What is impossible with men is possible with God.
John 11:40
Jesus saith to her, Did I not tell thee, that if thou wouldst believe, thou shouldst see the glory of God?
1 Corinthians 12:9
to another faith, by the same Spirit; to another the gifts of healing, by the one Spirit;
Hebrews 3:19
So then we see that they could not enter in because of unbelief.