(5) باب كَرَاهَةِ انْتِبَاذِ التَّمْرِ وَالزَّبِيبِ مَخْلُوطَيْنِ
'Abdullah b. Abu Qatada, on the authority of his father, reported Allah's Apostle (ﷺ) forbidding the preparation of the mixture of ripe dates and unripe dates, and the mixture of grapes and dates, and that of nearly ripe dates and fresh dates but the Prophet said:
Prepare the Nabidh from each one of them separately.
Reference: Sahih Muslim 1988 e
In-book reference: Book 36, Hadith 32
USC-MSA web (English) reference(deprecated numbering scheme): Book 23, Hadith 4907