Sahih Bukhari

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