Hadith 15:293
Abu Bakr narrated to us, he said: Yazid bin Harun narrated to us, from al-Muthanna, from Abu Nadra, from Abu Sa’id, he said: The Messenger of Allah (may Allah bless him and grant him peace) forbade mixing dates and raisins together. And he forbade mixing unripe dates (busr) and ripe dates (tamr) together.
حدثنا أبو بكر قال حدثنا يزيد بن هارون عن المثنى عن أبي نضرة عن أبي سعيد قال نهى رسول الله صلى الله عليه وسلم عن التمر والزبيب يخلطان وعن البسر والتمر يخلطان