´It was narrated that Anas bin Malik said:` "The Messenger of Allah [SAW] forbade us to soak two things together when one is more potent than the other. I asked him about Fadikh (a drink made from fresh dates cut open) and he forbade it. He disliked the extra bit on Al-Busr, fearing that that might make it two things, so we used to cut it off."
Explanation & Benefits
Hafiz Muhammad Ameen
(1) "Will intensify"—that is, by mixing two types of fruit, the effect will become stronger and intoxication will occur more quickly. Therefore, it is prohibited to prepare nabidh by mixing two types of fruit. The details of this have already been mentioned previously.
(2) Fadheekh: This was a type of wine that was prepared from unripe dates (gudar) without being cooked over fire. It was intoxicating, and therefore prohibited.
(3) "Ripened on one side"—ripened on one side and unripe on the other. In effect, even such a single date is, outwardly, like two types of fruit: both gudar (unripe date) and rutab (freshly ripened date). Therefore, it is better to avoid making nabidh from such a date, as was done by Sayyiduna Anas radi Allahu anhu. If both parts are separated and nabidh is prepared from only one part, then there remains no issue of dislike at all, as is mentioned in the hadith.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 5565