Sayyiduna Zayd bin Thabit (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) "granted a concession and permitted, in the 'araya sale, dried dates and fresh dates, and did not grant a concession in anything other than that."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10670