Luke 17:6

And the Lord said, "If ye had faith like a grain of mustard seed, and should say unto this sycamine tree, 'Pluck thyself up by the roots, and plant thyself in the sea': he should obey you.

Matthew 17:20

Jesus said unto them, "Because of your unbelief. For I say verily unto you, if ye had faith as a grain of mustard seed, ye should say unto this mountain, remove hence to yonder place, and he should remove: Neither should any thing be impossible for you to do.

Matthew 21:21

Jesus answered, and said unto them, "Verily I say unto you, if ye shall have faith, and shall not doubt, ye shall not only do that which I have done to the fig tree: but also if ye shall say unto this mountain, take thyself away, and cast thyself into the sea, it shall be done.

Mark 9:23

And Jesus said unto him, "Yea if thou couldest believe, all things are possible to him that believeth."

Luke 13:19

It is like a grain of mustard seed, which a man took and sowed in his garden: and it grew, and waxed a great tree, and the fowls of the air made nests in the branches of it."

Matthew 13:31-32

Another parable he put forth unto them saying, "The kingdom of heaven is like unto a grain of mustard seed, which a man taketh and soweth in his field, which is the least of all seeds.

Mark 11:22-23

And Jesus answered, and said unto them, "Have confidence in God.

Luke 19:4

Wherefore, he ran before, and climbed up into a wild fig tree to see him. For he should come that same way.

1 Corinthians 13:2

And though I could prophesy, and understood all secrets, and all knowledge: yea, if I had all faith so that I could move mountains out of their places, and yet had no love, I were nothing.

Treasury of Scripture Knowledge

Summary

And the Lord said, If ye had faith as a grain of mustard seed, ye might say unto this sycamine tree, Be thou plucked up by the root, and be thou planted in the sea; and it should obey you.

Bible References

If

Matthew 17:20
Jesus said unto them, "Because of your unbelief. For I say verily unto you, if ye had faith as a grain of mustard seed, ye should say unto this mountain, remove hence to yonder place, and he should remove: Neither should any thing be impossible for you to do.
Matthew 21:21
Jesus answered, and said unto them, "Verily I say unto you, if ye shall have faith, and shall not doubt, ye shall not only do that which I have done to the fig tree: but also if ye shall say unto this mountain, take thyself away, and cast thyself into the sea, it shall be done.
Mark 9:23
And Jesus said unto him, "Yea if thou couldest believe, all things are possible to him that believeth."
Mark 11:22
And Jesus answered, and said unto them, "Have confidence in God.
1 Corinthians 13:2
And though I could prophesy, and understood all secrets, and all knowledge: yea, if I had all faith so that I could move mountains out of their places, and yet had no love, I were nothing.

As

Luke 13:19
It is like a grain of mustard seed, which a man took and sowed in his garden: and it grew, and waxed a great tree, and the fowls of the air made nests in the branches of it."
Matthew 13:31
Another parable he put forth unto them saying, "The kingdom of heaven is like unto a grain of mustard seed, which a man taketh and soweth in his field, which is the least of all seeds.