(89) باب إِذَا أَرَادَ بَيْعَ تَمْرٍ بِتَمْرٍ خَيْرٍ مِنْهُ
Narrated Abu Sa`id Al-Khudri and Abu Huraira:
Allah's Messenger (ﷺ) appointed somebody as a governor of Khaibar. That governor brought to him an excellent kind of dates (from Khaibar). The Prophet (ﷺ) asked, "Are all the dates of Khaibar like this?" He replied, "By Allah, no, O Allah's Messenger (ﷺ)! But we barter one Sa of this (type of dates) for two Sas of dates of ours and two Sas of it for three of ours." Allah's Messenger (ﷺ) said, "Do not do so (as that is a kind of usury) but sell the mixed dates (of inferior quality) for money, and then buy good dates with that money."
Reference: Sahih al-Bukhari 2201, 2202
In-book reference: Book 34, Hadith 148
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 405