Mark 4:26-29 - The Parable Of The Seed That Grows By Itself
26 And he said, "The kingdom of God is like this: like a man scatters seed on the ground. 27 And he sleeps and gets up, night and day, and the seed sprouts and grows--{he does not know how}. 28 By itself the soil produces a crop: first the grass, then the head of grain, then the full grain in the head. 29 But when the crop permits, he sends [in] the sickle right away, because the harvest has come."