Sunan Ibn Majah, Chapter: The Chapters on Food

that a man visited Ali bin Abu Talib and he made some food for him.* Fatimah said: "Why don't we invite the Prophet (saw) to eat with us?" So they invited him and he came. He put his hand on the doorpost of the house and saw a thin curtain in the corner of the house, so he went back. Fatimah said to Ali: "Go and catch up with him, and ask him: What made you go back, O Messenger of Allah?" He said: "I do not enter a well-decorated house."