Matthew 17:20

"Because of your little faith," he answered. "In solemn truth I tell you that if you have faith the size of a mustard-seed, you can say to this mountain, 'Move from this place to that!' and it will move; and nothing will be impossible to you.

Luke 17:6

"If your faith," answered Jesus, "were like a grain of mustard-seed, you would say to this tree, 'Tear yourself up and be planted in the sea,' and it would obey you.

Matthew 13:31

He set forth to them another parable, saying. "The kingdom of heaven is like a mustard-seed which a man took and planted in his field.

Matthew 21:21

In reply Jesus said to them, "In solemn truth I tell you that if you have faith and never doubt, you will not only do what has been done to the fig tree, but even if you say to this mountain, 'Up, cast yourself into the sea!' it shall be done;

Mark 11:23

"In solemn truth I tell you that if any one shall say to this mountain, 'Up and hurl yourself into the sea!' and shall not doubt in his heart, but on the contrary shall believe that what he says will happen, it will be granted him.

1 Corinthians 13:2

Though I have the gift of prophecy and understand all mysteries and all knowledge, and have all faith, so that I could remove mountains, but have not love, I am nothing.

Mark 9:23

Jesus said to him. "'If you can'! All things can be for one who believes."

Matthew 14:30-31

But when he saw the wind, he was afraid, and as he began to sink, he cried out, "Master, save me!"

Matthew 17:9

While they were going down from the mountain, Jesus laid a command on them. "Speak to no man about the vision," he said, "until after the Son of man has been raised from the dead."

Matthew 17:17

In reply Jesus said: "O faithless and perverse generation, how long shall I be with you? How long shall I endure you? Bring him here to me!"

Mark 4:31

It is like a mustard-seed, which, when sown in the soil, is the smallest seed in the world;

Luke 1:37

"For no word of God shall be void of power."

Luke 18:27

"Things that are impossible with men," he answered them, "are possible with God."

John 11:40

Jesus answered her, "Did I not tell you that if you would believe you should see the glory of God?"

1 Corinthians 12:9

to one man by the same Spirit is given faith, to another gifts of healing by the one Spirit;

Hebrews 3:19

So you see that it was through unbelief that they were not able to enter in.

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
In reply Jesus said: "O faithless and perverse generation, how long shall I be with you? How long shall I endure you? Bring him here to me!"
Matthew 14:30
But when he saw the wind, he was afraid, and as he began to sink, he cried out, "Master, save me!"
Hebrews 3:19
So you see that it was through unbelief that they were not able to enter in.

A grain

Matthew 13:31
He set forth to them another parable, saying. "The kingdom of heaven is like a mustard-seed which a man took and planted in his field.
Mark 4:31
It is like a mustard-seed, which, when sown in the soil, is the smallest seed in the world;

Nothing

Mark 9:23
Jesus said to him. "'If you can'! All things can be for one who believes."
Luke 1:37
"For no word of God shall be void of power."
Luke 18:27
"Things that are impossible with men," he answered them, "are possible with God."