'Grain' in the Bible

For it says in the law of Moses, It is not right to keep the ox from taking the grain when he is crushing it. Is it for the oxen that God is giving orders?

Or has he us in mind? Yes, it was said for us; because it is right for the ploughman to do his ploughing in hope, and for him who is crushing the grain to do his work hoping for a part in the fruits of it.

And when you put it into the earth, you do not put in the body which it will be, but only the seed, of grain or some other sort of plant;