Shalok, First Mahalaa:

When the crop is ripe, then it is cut down; only the stalks are left standing.

The corn on the cob is put into the thresher, and the kernels are separated from the cobs.

Placing the kernels between the two mill-stones, people sit and grind the corn.

Those kernels which stick to the central axle are spared-Nanak has seen this wonderful vision! ||1||