Hadith 683:2
'Affan narrated to us, Shu'bah narrated to us, al-Hakam narrated to us, he said: I heard Ibn Abi Layla, from a man among the companions of the Prophet, may Allah bless him and grant him peace, "that he forbade mixing unripe dates with ripe dates, and raisins with dates."
حدثنا عفان، حدثنا شعبة، حدثنا الحكم، قال: سمعت ابن أبي ليلى، عن رجل من أصحاب النبي صلى الله عليه وسلم، " أنه نهى عن البلح والتمر والزبيب والتمر "