Matthew 13:31-32 - The Parable Of The Mustard Seed
31 Another figure which he used in speaking to them was this: "The Kingdom of Heaven is like a mustard seed which a man took and sowed in his field. 32 It is the smallest of all seeds, but when it is grown it is the largest of plants and grows into a tree, so that the wild birds come and roost in its branches."
30 "How can we find any comparison," he said, "for the reign of God, or what figure can we use to describe it? 31 It is like a mustard seed, which, when sown in the ground, though it is the smallest of all the seeds in the world, 32 yet once sown, comes up and grows to be the largest of all the plants, and produces branches so large that the wild birds can roost under the shelter of it."
33 With many such figures he told them the message, as far as they were able to receive it. 34 He said nothing to them except in figures, but in private he explained everything to his own disciples.