Abu Sa'id reported that Allah's Apostle (ﷺ) prohibited that fresh dates and grapes be mixed together and that fresh dates and unripe dates be mixed together.
Abu Sa'id al-Khudri reported Allah's Messenger (ﷺ) 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 bin Muslim al-'Abadi reported on the authority of the same chain of transmitters: Allah's Messenger (ﷺ) 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.