Bukhari :: Book 7 :: Volume 72 :: Hadith 811
Narrated Abu Huraira :
The Prophet said, "(Allah said), 'Every good deed of Adam's son is for him except fasting; it is for Me. and I shall reward (the fasting person) for it.' Verily, the smell of the mouth of a fasting person is better to Allah than the smell of musk."
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