The Messenger of Allah ﷺ forbade combining fresh dates with unripe dates, and dried dates with raisins.
حدثنا يحيى بن سعيد عن عبد الملك أخبرني عطاء
نهى رسول الله ﷺ عن الرطب والبسر والتمر والزبيب
Its isnad is sahih, mentioned previously in 14133.