What did the Prophet Muhammad (peace be upon him) forbid with regard to bartering of food products?
 Narrated Ibn `Umar:                     Allah's Apostle forbade Al-Muzabana, i.e. to sell ungathered dates of one's garden for measured dried dates or fresh ungathered grapes for measured dried grapes; or standing crops for measured quantity of foodstuff. He forbade all such bargains.