Matthew 13:31-32 - The Parable Of The Mustard Seed
31 He put another story before them, saying, The kingdom of heaven is like a grain of mustard seed which a man took and put in his field: 32 Which is smaller than all seeds; but when it has come up it is greater than the plants, and becomes a tree, so that the birds of heaven come and make their resting-places in its branches.
30 And he said, What picture may we give of the kingdom of God, or with what story may we make it clear? 31 It is like a grain of mustard seed, which, when it is put in the earth, is smaller than all the seeds on the earth, 32 But when it is planted, it comes up, and becomes taller than all the plants, and puts out great branches, so that the birds of heaven are able to take rest in its shade.
33 And with a number of such stories he gave them his teaching, as they were able to take it: 34 And without a story he said nothing to them: but privately to his disciples he made all things clear.