Mark 4:26-29 NIV

[26] He also said, “This is what the kingdom of God is like. A man scatters seed on the ground. [27] Night and day, whether he sleeps or gets up, the seed sprouts and grows, though he does not know how. [28] All by itself the soil produces grain—first the stalk, then the head, then the full kernel in the head. [29] As soon as the grain is ripe, he puts the sickle to it, because the harvest has come.”