Sahih Muslim , Hadith 1981 ⓘ
Anas b. Malik is reported to have said that Allah's Messenger had forbidden to mixture fresh dates and unripe dates and then drinking (the wine prepared out of it), and that was their common intoxicant when liquor was prohibited.
وَحَدَّثَنِي أَبُو الطَّاهِرِ، أَحْمَدُ بْنُ عَمْرِو بْنِ سَرْحٍ أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، أَنَّ قَتَادَةَ بْنَ دِعَامَةَ، حَدَّثَهُ أَنَّهُ، سَمِعَ أَنَسَ بْنَ مَالِكٍ، يَقُولُ إِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى أَنْ يُخْلَطَ التَّمْرُ وَالزَّهْوُ ثُمَّ يُشْرَبَ وَإِنَّ ذَلِكَ كَانَ عَامَّةَ خُمُورِهِمْ يَوْمَ حُرِّمَتِ الْخَمْرُ .
also referenced under: Book 36, Hadith 11 (In-Book) & Book 23, Hadith 4888 (USC-MSA)