I asked 'Aishah: Would the Messenger of Allah (ﷺ) fast three days every month ? She replied: Yes. I asked: Which days in the month he used to fast ? She replied: He did not care which days of the month he fasted.
Reference: Sunan Abi Dawud 2453 In-book : Book 14, Hadith 141 English translation : Book 13, Hadith 2447
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