Sahih Muslim Book 10, Hadith Number 3676.

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

Ibn Umar (Allah be pleased with them) reported Allah’s Apostle (may peace be upon him) forbidding the sale of fruits until their good condition becomes evident and the purchase of dates for dates. Zaid b. Thabit (Allah be pleased with him) said that Allah’s Messenger (may peace be upon him) gave a concession in case of the sale known as al-araya, there is an addition of the word an tuba’a in the hadith transmitted by Ibn Numair.