´It was narrated that 'Utbah bin Farqad said:` "The Nabidh that 'Umar bin Al-Khattab used to drink had turned to vinegar."
Explanation & Benefits
Hafiz Muhammad Ameen
In this, water was mixed due to the sourness, not because of intoxication, just as vinegar is sour. There is a great difference between sourness and intoxication; otherwise, vinegar would also be unlawful. Such sour nabidh was drunk for digestion, like vinegar. Furthermore, according to the preferred opinion, this narration is authentic, as Imam al-Nasa’i rahimahullah has also indicated.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 5710