Volume 3, Book 34, Number 294:
Narrated Abu Said:
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 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).
Volume 3 – 471 / 1700
SAHIH BUKHARI VOLUME 3 > BOOK 34: SALES AND TRADE