One of the Ansar whose kunya was Abu Shu'aib had a servant who sold meat. He said, “Prepare for me food which will be enough for five; perhaps I shall invite the Prophet along with other four.” He prepared a small meal for him, and then he went and invited him. A man followed them, and the Prophet said, “A man has followed us, Abu Shu'aib, so if you wish you may let him join us, but if you wish you may leave him outside.” He replied, “No, I shall let him join us.”
Abu Huraira reported God’s Messenger as saying, “The worst kind of food is that at a wedding-feast to which the rich are invited and from which the poor are left out. If anyone rejects an invitation he has disobeyed God and His Messenger.”
Jabir reported God’s Messenger as saying, “When one of you is invited to a meal he must accept. If he wishes he may eat, but if he wishes he may leave the food alone.”