Sales in which a Price is paid for Goods to be Delivered Later (As-Salam)

Bukhari :: Book 3 :: Volume 35 :: Hadith 451

Narrated Abu Al-Bakhtari:

I asked Ibn Umar about Salam (the fruits of) date-palms. He replied, "The Prophet forbade the sale of dates till their benefit becomes evident and fit for eating and also the sale of silver (for gold) on credit." I asked Ibn 'Abbas about Salam for dates and he replied, "The Prophet forbade the sale of dates till they were fit for eating and could be estimated."