The Prophet (ﷺ) said that your Lord said, "Every (sinful) deed can be expiated; and the fast is for Me, so I will give the reward for it; and the smell which comes out of the mouth of a fasting person, is better in Allah's Sight than the smell of musk." (See Hadith No. 584)
Reference: Sahih al-Bukhari 7538 In-book : Book 97, Hadith 163 USC-MSA web (English) : Vol. 9, Book 93, Hadith 629 (deprecated)
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