Hadithcore
Riyad as-Salihin, 1261

Mu'adhah Al-'Adawiyah (May Allah be pleased with her) reported:

I asked 'Aishah (May Allah be pleased with her). Did the Messenger of Allah (ﷺ) use to observe three days of Saum (fasting) in every month?" She replied, "Yes." I asked, "On which days in the month did he observed fast?" She replied that he did not mind on which days of the month he observed fast. <b>[Muslim]</b>.

وعن معاذة العدوية أنها سألت عائشة رضي الله عنها‏:‏ أكان رسول الله صلى الله عليه وسلم يصوم من كل شهر ثلاثة أيام، فقالت‏:‏ نعم‏.‏ فقلت‏:‏ من أي الشهر كان يصوم‏؟‏ قالت‏:‏ لم يكن يبالي من أي الشهر يصوم‏.‏ ‏(‏‏(‏رواه مسلم‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 8, Hadith 271
Sharh · explanationclick to expand
<b>Guidance from the Hadiths:</b><br> 1) Fasting three days every month is equivalent to fasting the whole year, for a good deed is rewarded by ten times as much.<br> 2) Fasting the three days in the middle of the month - 13, 14, and 15 - is the best form of fasting, for this was the more frequent practice of the Prophet (may Allah’s peace and blessings be upon him).<br> 3) They show the merit of the Companions, as they were keen to act upon the Prophet’s instructions throughout their lives.
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