Chapter 35: Sales in which a Price is paid for Goods to be Delivered Later (As-Salam)
Narrated Abu Al-Bakhtari: I asked Ibn 'Umar about Salam (the fruits of) date-palms. He replied, "The Prophet (ﷺ) 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 (ﷺ) forbade the sale of
dates till they were fit for eating and could be estimated."
Sahih al-Bukhari 2248