Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates that Sayyiduna Zayd bin Thabit (may Allah be pleased with him) told him that the Prophet of Allah (peace and blessings be upon him) permitted selling araya for fresh or dried dates, and did not permit any other form.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4744