'Grain' in the Bible

And it came about that on the Sabbath day he was going through the grain-fields; and while they were walking, his disciples took the heads of grain.

The earth gives fruit by herself; first the leaf, then the head, then the full grain.

But when the grain is ready, he quickly sends men to get it cut, because the time for cutting has come.

It is like a grain of mustard seed, which, when it is put in the earth, is smaller than all the seeds on the earth,