It wasnarrated from Abu Hurairah that the Messenger of Allah (ﷺ)said:
'Do not make Nabidh with dried dates and unripe dates together,make Nabidh with each of them on its own." (RU)
English reference (RU): Vol. 4, Book 30, Hadith 3396 (RU)
Arabic reference (RU): Book 30, Hadith 3522 (RU)