The following is the results of your search for grain.
Grain: Used, in
(Amos 9:9) of a small stone or kernel; in
(Matthew 13:31) of an
individual seed of mustard; in
(John 12:24; 1 Corinthians 15:37) of wheat. The
Hebrews sowed only wheat, barley, and spelt; rye and oats are not
mentioned in Scripture.