Mark 4:26-29

Then He said, “The kingdom of God is like a man who throws seed on the ground; and he goes to bed at night and gets up every day, and [in the meantime] the seed sprouts and grows; how [it does this], he does not know. The earth produces crops by itself; first the blade, then the head [of grain], then the mature grain in the head. But when the crop ripens, he immediately puts in the sickle [to reap], because [the time for] the harvest has come.”