Jabir b. Abdullah al-Ansari reported that Messenger of Allah ﷺ Prohibited the preparation of Nabidh by mixing grapes and fresh dates. and he forbade the preparation of Nabidh by mixing unripe dates with fresh dates. (Using translation from Muslim 1986d)  

عَنْ رَسُولِ اللهِ ﷺ أَنَّهُ «نَهَى أَنْ يُنْبَذَ الزَّبِيبُ وَالْبُسْرُ جَمِيعًا وَنَهَى أَنْ يُنْبَذَ الْبُسْرُ وَالرُّطَبُ جَمِيعًا»