Mark 4:26-29 - The Parable Of The Seed That Grows By Itself
26 And Jesus said, "The kingdom of God is like a farmer who scattered seed on the ground, 27 then went to bed and got up the next day to find that the seed had sprouted and grown, yet he did not know how it happened. 28 The soil yields its crop, first the green sprout, then the ears of grain, and then the kernels in the ears. 29 But when the grain ripens the farmer wields his sickle because harvest time has come."