Matthew:13:31-32 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:  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.
See All...; Mark:4:30-32 And he said, What picture may we give of the kingdom of God, or with what story may we make it clear?  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,  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.
See All...; Luke:13:18-19 Then he said, What is the kingdom of God like? what comparison may I make of it?  It is like a grain of mustard seed which a man took and put in his garden, and it became a tree, and the birds of heaven made their resting-places in its branches.