Sahih Muslim 1981
Sahih Muslim · Book 36: The Book of Drinks · The prohibition of Khamr, which may be made from the juice of grapes, dried dates, unripe dates, raisins and other things that intoxicate
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 .
Anas b. Malik is reported to have said that Allah's Messenger (ﷺ) 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.