'Mustard seed' in the Bible

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.

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.

It is like a grain of mustard seed, which when it is sown in the earth, is the least of all seeds that be in the earth:

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."

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.