Abdullah bin Zareer says that once I was present in the service of Sayyiduna Ali (may Allah be pleased with him), he presented khazeerah (a dish of meat and bread) before us. I casually said, "May Allah bless you, what would have happened if you had presented duck before us? Now Allah has also bestowed abundance of war booty." He replied, "Ibn Zareer! I heard the Prophet (peace and blessings be upon him) say that only two bowls are lawful for the caliph from Allah's wealth: one bowl from which he and his family may eat, and the other bowl which he presents before the people."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 578