Parable of the Mustard Seed

The Parable of the Mustard Seed is one of the parables of Jesus. It is found in three of the Gospels of the New Testament: Gospel of Matthew (13:31–32), Gospel of Mark (4:30–32), and Gospel of Luke (13:18–19). The differences among the three tellings are minor. 
In Matthew and Luke, this parable is followed by the Parable of the Leaven. The Parable of the Leaven also has a theme about the Kingdom of Heaven growing from small beginnings. A version of the parable also occurs in the non-canonical Gospel of Thomas 20.
The parable from Matthew reads: "The Kingdom of Heaven is like a grain of mustard seed, which a man took, and sowed in his field; which indeed is smaller than all seeds. But when it is grown, it is greater than the herbs, and becomes a tree, so that the birds of the air come and lodge in its branches." The parables from Mark and Luke are similar.