472.Hadhrat Abu Hurairah (Allah be pleased with him) in a lengthy hadith, narrates that Muhammad (peace be upon him) said: "I swear by That Being in Whose possession is the life of Muhammad! The odour of the mouth of a fasting person is sweeter to Allah Ta'ala than the fragrance of musk."
(Bukhari).
(Hayaat-ul-Muslimeen. by Mohammad Ashraf Ali Thanvi).