Sahih Muslim Book 10, Hadith Number 3689.

Chapter : It is forbidden to sell fresh dates against dry dates, except in case of al-Araya.

Bushair b. Yasir reported on the authority of some of the Companions of Allah’s Messenger (may peace be upon him) from among the members of his family that he forbade (the direct exchange of a commodity having different qualities) but with the change that Ishaq and Ibn al-Muthanna used the word Zabn in place of Riba and Ibn Abu ‘Umar used the word Riba (interest).