Jabalah bin Suhaim narrates: Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) passed by us and said: Do not eat (two dates) together, because the Noble Prophet (peace and blessings be upon him) forbade eating (two dates) together at once. However, if a person obtains permission from his brother (then the ruling is different).
Hadith Referenceصحیح ابن حبان / كتاب الأطعمة / 5231
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «الصحيحة» (2323): ق.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط الشيخين