Sahih Muslim#3600
It is false, fabricated and a blasphemous attack (nauzubillah) against the honorable Prophet PBUH. These are the words of Satan which he has spread through his human partners. Satan is known to order immorality (2:268), while the honorable Prophet possesses the highest and most sublime moral character (68:4). Please disregard all such rubbish. The source of our religious guidance is the Book given to us by Prophet, not a book written in Iran centuries after the Prophet.