It is narrated from Hazrat Abu Qatadah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) forbade making nabidh by mixing unripe and ripe dates, raisins and dates, red dates and unripe dates, and fresh dates.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22618