'Grain' in the Bible

You shall come to your grave in a full age, like a shock of grain comes in its season.

They are exalted; yet a little while, and they are gone. Yes, they are brought low, they are taken out of the way as all others, and are cut off as the tops of the ears of grain.

Will you confide in him, that he will bring home your seed, and gather the grain of your threshing floor?