Mark 4:26-29 - The Parable Of The Seed That Grows By Itself
26 And he said, So is the kingdom of God as a man casts the seeds into the earth, 27 and sleeps and wakes, night and day, and the seed germinates, and grows he knows not how. 28 The earth produces spontaneously, first the stalk, then the head, then the full wheat in the head. 29 And when the wheat delivers itself, he immediately sends out the sickle, because the harvest has come.