Sahih Muslim Book 26, Hadith Number 5517.

Chapter : Omen, divinations and that which is unlucky.

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.