Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates from Sayyiduna Abu Talhah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) forbade (when eating dates) eating two dates together at a time.
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 4699