Sayyiduna Zayd bin Thabit (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) "permitted the 'araya sale for fresh or dried dates," and he (peace and blessings be upon him) did not permit anything other than that.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10669