ذِكْرُ الْعِلَّةِ الَّتِي مِنْ أَجْلِهَا زُجِرَ عَنْ هَذَا الْفِعْلِ
Anas b. Malik is reported to have said that Messenger of Allah 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. (Using translation from Muslim 1981)
«أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى أَنْ يُخْلَطَ التَّمْرُ بِالزَّهْوِ ثُمَّ يُشْرَبَ وَإِنَّ ذَلِكَ عَامَّةُ خُمُورِهِمْ يَوْمَ حُرِّمَتِ الْخَمْرُ»