Mark 4:27-31

And should sleep, and rise night and day, and the seed should spring and grow up, he knoweth not how.

For the earth bringeth forth fruit of herself; first the blade, then the ear, after that the full corn in the ear.

But when the fruit is brought forth, immediately he putteth in the sickle, because the harvest is come.

And he said, Whereunto shall we liken the kingdom of God? or with what comparison shall we compare it?

It is like a grain of mustard seed, which, when it is sown in the earth, is less than all the seeds that be in the earth: