The Book on Salutations and Greetings (Kitab As-Salam)
Muslim :: Book 26 : Hadith 5517
Abu Huraira reported: I heard Allah's Messenger (may peace be upon him) as saying: There is no divination but the best type is the good omen. It was said to Allah's Messenger (may peace be upon him): What is good omen? Thereupon he said: A good word which one of you hears.