The Prophet ﷺ forbade mixing dates and raisins together, and forbade mixing unripe dates and ripe dates together. He also wrote to the people of Jurash forbidding them from the mixture of dates and raisins.In another version, the mention is only of dates and raisins, without mentioning unripe dates and ripe dates.
وحدثنيه وهب بن بقية أخبرنا خالد يعني الطحان عن الشيباني بهذا الإسناد في التمر والزبيب ولم يذكر البسر والتمر