Mu'bad bin Ka'b narrates from his mother, "who had prayed with the Prophet Muhammad (peace be upon him) facing both Qiblahs," that I heard the Prophet Muhammad (peace be upon him) forbidding the mixing of dates and raisins together to make nabidh, and the Prophet Muhammad (peace be upon him) said that make nabidh from each of them separately.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 23932
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد حسن