Abu Huraira reported Allah's Messenger (ﷺ) as saying:
Allah, the Majestic and the Exalted, said: Every act of the son of Adam is for him except fasting. It is done for My sake, and I will give a reward for it. By Allah in Whose Hand is the life of Muhammad, the breath of the observer of fast is sweeter to Allah than the fragrance of musk.
Reference: Sahih Muslim 1151 b In-book : Book 13, Hadith 210 USC-MSA web (English) : Book 6, Hadith 2564 (deprecated)
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