What did Prophet Muhammad (saw) forbid concerning the sale of dates and silver?
 Narrated Abu Al-Bakhtari:                     I asked Ibn `Umar about Salam for dates. Ibn `Umar replied, "The Prophet forbade the sale (the fruits) of date-palms until they were fit for eating and also forbade the sale of silver for gold on credit." I also asked Ibn `Abbas about it. Ibn `Abbas replied, "The Prophet forbade the sale of dates till they were fit for eating, and could be weighed." I asked him, "What is to be weighed (as the dates are on the trees)?" A man sitting by Ibn `Abbas said, "It means till they are cut and stored."