Abu Huraira (Allaah be pleased with him)reported Allaahs Messenger (Pace and Blessing be Upon Him) as saying: Dates are to be paid for by dates, wheat by wheat, Barley by Barley, salt by salt, like for like, payment being made on the spot. He who made an addition or demanded an addition, in fact, dealt in usury except in case where their classes differ. Sahih Muslim, book of business transactions.
Habitat & Distribution:
Wheat is a widely grown winter crop; it is originated from the Mediterranean region. Wheat is one of the first cereals known to have been domesticated in the world.