Mishkat al-Masabih #1981
Fasting
He said that the Prophet used to fast on Mondays and Thursdays, and when someone remarked on this to him he said, “On Monday and Thursday God forgives every Muslim except two who are at variance, for He says they must be left till they make peace with one another.”
Ahmad and Ibn Majah transmitted it.
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About Mishkat al-Masabih
This hadith is #1981 from Mishkat al-Masabih, in the Book of Fasting. Mishkat al-Masabih contains 4,428 hadiths across 25 books.