Sahih Muslim Book 8, Hadith Number 3436.
Chapter: The child is attributed to one on whose bed it is born and one must avoid suspicion.
A hadith like this is narrated on the authority of Ibn ‘Uyaiyna and Ma’mar (and the words are): The child is attributed to him on whose bed he is born; but they did not mention this: “For a fornicator there is stoning.”