Hunaydah al-Khuza'i reported on the authority of her mother who said: I entered upon Umm Salamah and asked her about fasting. She said: The Messenger of Allah (ﷺ) used to command me to fast three days every month beginning with Monday or Thursday.
Reference: Sunan Abi Dawud 2452 In-book : Book 14, Hadith 140 English translation : Book 13, Hadith 2446
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