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 for dates. Ibn 'Umar replied, "The Prophet (ﷺ) 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 (ﷺ) 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."
Sahih al-Bukhari 2250