Sahih Muslim
The Book of Drinks (Kitab Al-Ashriba)
Book Number: 023 / Hadith Number: 4903
Abu Sa'id al-Khudri reported Allah's Messenger (may peace be upon him) as saying: He who amongst you drinks Nabidh should drink that (prepared either from) grapes alone, or from dates alone, or from unripe dates alone (and not by mixing them with one another).
Isma'il b. Muslim al-'Abadi reported on the authority of the same chain of transmitters: Allah's Messenger (may peace be upon him) prohibited us that we should mix dry dates with unripe dates or (mix) grapes with dry dates (and prepare Nabidh). He also said: He who amongst you drinks-the rest of the hadith is the same.