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." (ES)
English reference (ES): Vol. 4, Book 30, Hadith 3396 (ES)
Arabic reference (ES): Book 30, Hadith 3522 (ES)