Mark 4:26-29 - The Parable Of The Seed That Grows By Itself
26 He also said, "The kingdom of God is like someone who spreads seed on the ground. 27 He goes to sleep and gets up, night and day, and the seed sprouts and grows, though he does not know how. 28 By itself the soil produces a crop, first the stalk, then the head, then the full grain in the head. 29 And when the grain is ripe, he sends in the sickle because the harvest has come."