MUSLIM 1990a:
from Ibn ʿAbbās —
Ibn 'Abbas reported that Allah's Apostle ﷺ forbade the mixing of dates and grapes together, and mixing of unripe dates and ripe dates together (for preparing Nabidh), and he wrote to the people of Jurash (in Yemen) forbidding them to prepare the mixture of dates and grapes.
مسلم ١٩٩٠a:
عن ابن عباس —
نَهَى النَّبِيُّ ﷺ أَنْ يُخْلَطَ التَّمْرُ وَالزَّبِيبُ جَمِيعًا وَأَنْ يُخْلَطَ الْبُسْرُ وَالتَّمْرُ جَمِيعًا وَكَتَبَ إِلَى أَهْلِ جُرَشَ يَنْهَاهُمْ عَنْ خَلِيطِ التَّمْرِ وَالزَّبِيبِ
hadithunlocked.com