Safina told that 'Ali b. Abu Talib prepared food for a man who was his guest, and Fatima said, "I wish we had invited God’s Messenger and he had eaten with us.” They invited him and when he came he put his hands on the side-posts of the door, but when he saw the figured curtain which had been put at the end of the house he went away. Fatima said she followed him and asked, “What turned you back, Messenger of God?” He replied, “It is not fitting for me or for any prophet to enter a house which is decorated.”
‘Abdallah b. 'Umar reported God’s Messenger as saying, “He who does not accept an invitation which he receives has disobeyed God and His Messenger, and he who enters without an invitation enters as a thief and goes out as a raider.”
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.”
