The Prophet (ﷺ) said, "Allah said: The Fast is for Me and I will give the reward for it, as he (the one who observes the fast) leaves his sexual desire, food and drink for My Sake. Fasting is a screen (from Hell) and there are two pleasures for a fasting person, one at the time of breaking his fast, and the other at the time when he will meet his Lord. And the smell of the mouth of a fasting person is better in Allah's Sight than the smell of musk." (See Hadith No. 128, Vol. 3).
Reference: Sahih al-Bukhari 7492 In-book : Book 97, Hadith 118 USC-MSA web (English) : Vol. 9, Book 93, Hadith 584 (deprecated)
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