Mishkat al-Masabih #1945
Fasting
‘Abdallah b. Shaqiq said that when he asked ‘A'isha whether the Prophet used to fast a whole month she replied, "I never knew him to fast a whole month except Ramadan, nor to refrain from fasting some part of every month till he died."
Muslim transmitted it.
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About Mishkat al-Masabih
This hadith is #1945 from Mishkat al-Masabih, in the Book of Fasting. Mishkat al-Masabih contains 4,428 hadiths across 25 books.