Mark 4:26-32

And he said, So is the kingdom of God, as if a man should cast seed upon the earth; and should sleep and rise night and day, and the seed should spring up and grow, he knoweth not how. The earth beareth fruit of herself; first the blade, then the ear, then the full grain in the ear. But when the fruit is ripe, straightway he putteth forth the sickle, because the harvest is come. And he said, How shall we liken the kingdom of God? or in what parable shall we set it forth? It is like a grain of mustard seed, which, when it is sown upon the earth, though it be less than all the seeds that are upon the earth, yet when it is sown, groweth up, and becometh greater than all the herbs, and putteth out great branches; so that the birds of the heaven can lodge under the shadow thereof.