'Mustard' in the Bible

Another parable set he before them, saying, The kingdom of the heavens is like a grain of mustard seed which a man took and sowed in his field;

And he says to them, Because of your unbelief; for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say to this mountain, Be transported hence there, and it shall transport itself; and nothing shall be impossible to you.

As to a grain of mustard seed, which, when it is sown upon the earth, is less than all seeds which are upon the earth,

It is like a grain of mustard seed which a man took and cast into his garden; and it grew and became a great tree, and the birds of heaven lodged in its branches.

But the Lord said, If ye have faith as a grain of mustard seed, ye had said to this sycamine tree, Be thou rooted up, and be thou planted in the sea, and it would have obeyed you.