Hadithcore
Riyad as-Salihin, 1258

Abu Hurairah (May Allah be pleased with him) reported:

My friend (the Messenger of Allah) (ﷺ) directed me to observe fast for three days in every month, to perform two Rak'ah (optional) Duha prayer at forenoon and to perform the Witr prayer before going to bed. <b>[Al-Bukhari and Muslim]</b>.

وعن أبي هريرة رضي الله عنه قال‏:‏ أوصاني خليلي صلى الله عليه وسلم بثلاث‏:‏ صيام ثلاثة أيام من كل شهر، وركعتي الضحى وأن أوتر قبل أن أنام‏.‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏

References1 variant
In-Book Reference
Book 8, Hadith 268
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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