Matthew 13:Intro Jesus teaches the multitude in parables. Parable of the sower -- of the tares -- grain of mustard seed.
Matthew 13:30 And another parable put he forth unto them, saying, The kingdom of heaven is like to a grain of mustard seed, which a man took and sowed in his field;
Matthew 17:20 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 to yonder place, and it shall remove; and nothing shall be impossible unto you.
Mark 4:Intro The parable of the sower, and of the mustard seed.
Mark 4:25 It is like a grain of mustard seed, which, when it is sown in the earth, is less than all the seeds that be in the earth; but, when it is sown, it groweth up, and becometh greater than all herbs, and shooteth out great branches; so that the fowls of the air may lodge under the shadow of it.
Luke 13:Intro Parable of the fig tree -- Woman cured of infirmity -- Kingdom of God like a grain of mustard, and leaven -- Christ weepeth over Jerusalem.
Luke 13:19 It is like a grain of mustard, which a man took, and cast into his garden; and it grew, and waxed a great tree; and the fowls of the air lodged in the branches of it.
Luke 17:6 And the Lord said, If you had faith as a grain of mustard seed, you might say unto this sycamore tree, Be thou plucked up by the roots, and be thou planted in the sea; and it should obey you.