From Sahih Muslim (Hadith 5156):
Abu Qatada reported Allah's Messenger (ﷺ) as saying:Do not prepare Nabidh by mixing nearly ripe and fresh dates and do not prepare Nabidh by mixing together fresh dates and grapes, but prepare Nabidh out of each (one of them) separately. Yahya stated that he had met 'Abdullah b. Abu Qatada and he narrated it on the authority of his father that Allah's Apostle (ﷺ) said this
Reference: Muslim 5156