The Messenger of Allah ﷺ forbade the sale of date palms until their fruit becomes fit to eat.
حدثنا عبد الوهاب أخبرنا هشام عن أبي الزبير
نهى رسول الله ﷺ عن بيع النخل حتى يطعم
Its isnad is sahih, mentioned previously at 12575.