Mark 4:26-29 - The Parable Of The Seed That Grows By Itself
26 And he said, "The Kingdom of God is as if a man should cast seed on the earth, 27 and should sleep and rise night and day, and the seed should spring up and grow, he does not know how. 28 For the earth bears fruit: first the blade, then the ear, then the full grain in the ear. 29 But when the fruit is ripe, immediately he puts forth the sickle, because the harvest has come."