Matthew 17:20

"Because you have so little faith," he answered; "for, I tell you, if your faith were only like a mustard-seed, you could say to this mountain 'Move from this place to that!' and it would be moved; and nothing would be impossible to you."

Luke 17:6

But the Master said: "If your faith were only like a mustard- seed, you could say to this mulberry tree 'Be up-rooted and planted in the sea,' and it would obey you.

Matthew 13:31

Another parable which he told them was this-- "The Kingdom of Heaven is like a mustard-seed, which a man took and sowed in his field.

Matthew 21:21

"I tell you," replied Jesus, "if you have faith, without ever a doubt, you will do what not only what has been done to the fig tree, but, even if you should say to this hill 'Be lifted up and hurled into the sea!' it would be done.

Mark 11:23

"I tell you that if any one should say to this hill 'Be lifted up and hurled into the sea!', without ever a doubt in his mind, but in the faith that what he says will be done, he would find that it would be.

1 Corinthians 13:2

Even though I have the gift of preaching, and fathom all hidden truths and all the depths of knowledge; even though I have such faith as might move mountains, yet have not Love, I am nothing!

Mark 9:23

Why say 'possibly'?" Jesus replied. "Everything is possible for one who has faith."

Matthew 14:30-31

But, when he felt the wind, he was frightened, and, beginning to sink, cried out: "Master! Save me!"

Matthew 17:9

As they were going down the mountain side, Jesus gave them this warning-- "Do not speak of this vision to any one, until the Son of Man has risen from the dead."

Matthew 17:17

"O faithless and perverse generation!" Jesus exclaimed, "how long must I be among you? how long must I have patience with you? Bring the boy here to me."

Mark 4:31

By what can we illustrate it? Perhaps by the growth of a mustard-seed. This seed, when sown in the ground, though it is smaller than all other seeds,

Luke 1:37

For no promise from God shall fail to be fulfilled."

Luke 18:27

But Jesus said: "What is impossible with men is possible with God."

John 11:40

"Did not I tell you," replied Jesus, "that, if you would believe in me, you should see the glory of God?"

1 Corinthians 12:9

To another faith by the same Spirit; to another power to cure diseases by the one Spirit; to another supernatural powers;

Hebrews 3:19

We see, then, that they failed to enter upon it because of their want of faith.

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
"O faithless and perverse generation!" Jesus exclaimed, "how long must I be among you? how long must I have patience with you? Bring the boy here to me."
Matthew 14:30
But, when he felt the wind, he was frightened, and, beginning to sink, cried out: "Master! Save me!"
Hebrews 3:19
We see, then, that they failed to enter upon it because of their want of faith.

A grain

Matthew 13:31
Another parable which he told them was this-- "The Kingdom of Heaven is like a mustard-seed, which a man took and sowed in his field.
Mark 4:31
By what can we illustrate it? Perhaps by the growth of a mustard-seed. This seed, when sown in the ground, though it is smaller than all other seeds,

Nothing

Mark 9:23
Why say 'possibly'?" Jesus replied. "Everything is possible for one who has faith."
Luke 1:37
For no promise from God shall fail to be fulfilled."
Luke 18:27
But Jesus said: "What is impossible with men is possible with God."