Sahih Bukhari
Sahih Bukhari Volume 003, Book 049, Hadith Number 857.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 49. Peacemaking
Narated By Um Kulthum bint Uqba : That she heard Allah's Apostle saying, "He who makes peace between the people by inventing good information or saying good things, is not a liar."