(20) باب بَيْعِ الْخِلْطِ مِنَ التَّمْرِ
Narrated Abu Sa`id:
We used to be given mixed dates (from the booty) and used to sell (barter) two Sas of those dates) for one Sa (of good dates). The Prophet (ﷺ) said (to us), "No (bartering of) two Sas for one Sa nor two Dirhams for one Dirham is permissible", (as that is a kind of usury). (See Hadith No. 405).
Reference: Sahih al-Bukhari 2080
In-book reference: Book 34, Hadith 33
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 294