Mukhtasar Bukhari (Abridged) 1937 — Prohibition of mixing fresh

Sayyiduna Abu Qatadah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings of Allah be upon him) forbade mixing unripe and ripe dates together, and mixing dates and grapes together for soaking; rather, each of them should be soaked separately (then there is no harm).