Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates from Sayyiduna Zayd bin Thabit (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) permitted selling araya for dried and fresh dates, and did not permit any other form.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4742