Matthew 17:20

And Jesus said to them, For your unbelief: for truly I say to you, If ye have faith as a kernel of mustard, ye shall say to this mount, Go away from thence, and it shall go away; and nothing shall be impossible to you.

Luke 17:6

And the Lord said, If ye had faith as a kernel of mustard, said ye to this mulberry-tree, Be thou rooted up, and planted in the sea; and it had listened to you.

Matthew 13:31

Another parable set he before them, saying, The kingdom of the heavens is like a kernel of mustard, which a man taking, sowed in his field:

Matthew 21:21

And Jesus, having answered, said to them, Truly I say to you, if ye have faith, and be not removed, ye shall do not only that of the fig tree, but also to this mountain, if ye should say, Be thou lifted up, and cast into the sea, it shall be.

Mark 11:23

For truly I say to you, That whoever should say to this mountain, Be thou removed, and be thou cast into the sea; and should not discuss in his heart, but believe that what he says, is; it shall be to him, whatever he should say.

1 Corinthians 13:2

And if I have the gift of prophecy, and know all mysteries, and all knowledge; and if I have all faith to remove mountains, and have not love, I am nothing.

Mark 9:23

And Jesus said to him, If thou canst believe, all things possible to him believing.

Matthew 14:30-31

And seeing the wind strong, he was afraid: and beginning to sink, he cried out, Lord, save me.

Matthew 17:9

And they, coming down from the mountain, Jesus charged them, saying, Tell the sight to none, even till the Son of man rises from the dead.

Matthew 17:17

And Jesus, having answered, said, O faithless and perverted generation, how long shall I be with you how long shall I endure you? bring him here to me.

Mark 4:31

As a kernel of mustard, which, when it be sown in the earth, is smaller than all seeds upon the earth:

Luke 1:37

For nothing shall be impossible with God.

Luke 18:27

And he said, The things impossible with men, are possible with God.

John 11:40

Jesus says to her, Said I not to thee, if thou shouldest believe, thou shalt see the glory of God

1 Corinthians 12:9

And to another faith in the same Spirit; and to another graces of healings in the same Spirit;

Hebrews 3:19

And we see they could not come in through unbelief.

Treasury of Scripture Knowledge

Summary

And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.

Bible References

Because

Matthew 17:17
And Jesus, having answered, said, O faithless and perverted generation, how long shall I be with you how long shall I endure you? bring him here to me.
Matthew 14:30
And seeing the wind strong, he was afraid: and beginning to sink, he cried out, Lord, save me.
Hebrews 3:19
And we see they could not come in through unbelief.

A grain

Matthew 13:31
Another parable set he before them, saying, The kingdom of the heavens is like a kernel of mustard, which a man taking, sowed in his field:
Mark 4:31
As a kernel of mustard, which, when it be sown in the earth, is smaller than all seeds upon the earth:

Nothing

Mark 9:23
And Jesus said to him, If thou canst believe, all things possible to him believing.
Luke 1:37
For nothing shall be impossible with God.
Luke 18:27
And he said, The things impossible with men, are possible with God.