Matthew 17:20

And he said to them, "Because of your little faith. For truly I say to you, if you have faith like a mustard seed, you will say to this mountain, 'Move from here [to] there,' and it will move, and nothing will be impossible for you."

Luke 17:6

So the Lord said, "If you have faith like 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 put before them another parable, saying, "The kingdom of heaven is like a mustard seed that a man took [and] sowed in his field.

Matthew 21:21

And Jesus answered [and] said to them, "Truly I say to you, if you have faith and do not doubt, you will do not only [what was done to] the fig tree, but even if you say to this mountain, 'Be lifted up and thrown into the sea," it will happen!

Mark 11:23

Truly I say to you that whoever says to this mountain, 'Be lifted up and thrown into the sea!' and does not doubt in his heart, but believes that what he says will happen, it will be [done] for him.

1 Corinthians 13:2

And if I have [the gift of] prophecy and I know all mysteries and all knowledge, and if I have all faith so that [I can] remove mountains, but do not have love, I am nothing.

Mark 9:23

But Jesus said to him, "If you are able! All [things] [are] possible for the one who believes!"

Matthew 14:30-31

But [when he] saw the strong wind, he was afraid. And beginning to sink, he cried out, saying, "Lord, save me!"

Matthew 17:9

And [as] they were coming down from the mountain, Jesus commanded them saying, "Tell no one the vision until the Son of Man is raised from the dead."

Matthew 17:17

And Jesus answered [and] said, "O unbelieving and perverse generation! {How long} will I be with you? {How long} must I put up with you? Bring him here to me!"

Mark 4:31

[It is] like a mustard seed that when sown on the ground, [although it] is the smallest of all the seeds that [are] on the ground,

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 said to her, "Did I not say to you that if you believed, you would see the glory of God?"

1 Corinthians 12:9

to another faith by the same Spirit, to another gifts of healing by the one Spirit,

Hebrews 3:19

And [so] we see that they were not able to enter because of 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 answered [and] said, "O unbelieving and perverse generation! {How long} will I be with you? {How long} must I put up with you? Bring him here to me!"
Matthew 14:30
But [when he] saw the strong wind, he was afraid. And beginning to sink, he cried out, saying, "Lord, save me!"
Hebrews 3:19
And [so] we see that they were not able to enter because of unbelief.

A grain

Matthew 13:31
He put before them another parable, saying, "The kingdom of heaven is like a mustard seed that a man took [and] sowed in his field.
Mark 4:31
[It is] like a mustard seed that when sown on the ground, [although it] is the smallest of all the seeds that [are] on the ground,

Nothing

Mark 9:23
But Jesus said to him, "If you are able! All [things] [are] possible for the one who believes!"
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."