Sunan Ibn Majah, Volume 4, Book 30, Hadith 3396 (DarusSalam) ⓘ
It was narrated from Abu Hurairah that the Messenger of Allah said: ‘Do not make Nabidh with dried dates and unripe dates together, make Nabidh with each of them on its own.”
حَدَّثَنَا يَزِيدُ بْنُ عَبْدِ اللَّهِ الْيَمَامِيُّ، حَدَّثَنَا عِكْرِمَةُ بْنُ عَمَّارٍ، عَنْ أَبِي كَثِيرٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ تَنْبِذُوا التَّمْرَ وَالْبُسْرَ جَمِيعًا وَانْبِذُوا كُلَّ وَاحِدٍ مِنْهُمَا عَلَى حِدَتِهِ " .
also referenced under: Hadith 3396 (Reference) & Book 30, Hadith 3522 (In-Book)