The Prophet ﷺ forbade combining ripening dates with fully ripe dates, or dates with Zabib, when soaking them to make a drink. Each kind should be soaked separately.In another wording, "Do not soak ripening dates and fresh dates together, and do not soak fresh dates and Zabib together. Rather, soak each one on its own."
نهى النبي ﷺ أن يجمع بين التمر والزهو، والتمر والزبيب، ولينبذ كل واحد منهما على حدة. وفي لفظ: لا تنتبذوا الزهو والرطب جميعا، ولا تنتبذوا الرطب والزبيب جميعا، ولكن انتبذوا كل واحد على حدته.
Bukhari narrated it in the Book of Drinks (5602), and Muslim in the Book of Drinks (1988:24), both of them through Hisham Dastawai, who said, "Yahya bin Abu Kathir informed us, from Abdullah bin Abu Qatada, from his father," who said, then he related it. The wording given is Bukhari's, and the other wording belongs to Muslim, from the narration of Ali bin Mubarak, from Yahya (that is, Ibn Kathir), from Abu Salama, from Abu Qatada.Nasai narrated it (5567) through Abu Ismail, who said, "Yahya narrated it to us," with the same content, adding, "regarding the waterskins whose mouths are tied."This addition was narrated uniquely in this hadith by Abu Ismail, whose name is Ibrahim bin Abdul-Malik Basri Qannad, and his memory has been criticized. Aqeeli mentioned him in Duafa (57/1) and said, "He makes mistakes in hadith." Ibn Hibban mentioned him in Thiqat and said, "He errs." For this reason, Hafiz said, "He is truthful, but there is something questionable in his memory."Someone like him cannot be accepted when he narrates an addition on his own, especially since Hisham Dastawai and others narrated it from Yahya bin Abu Kathir without this addition, and he is the most reliable of people when it comes to Yahya.His statement, "yulath" (with the three-dotted letter) upon their mouths, means it is tied and fastened. What is meant by waterskins are those made of leather.