Hadithcore
Riyad as-Salihin, 1262

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

The Messenger of Allah (ﷺ) said, "If you want to observe Saum on three days in a month, then fast on the thirteenth, fourteenth and fifteenth of the (lunar) month." <b>[At-Tirmidhi]</b>.

وعن أبي ذر رضي الله عنه، قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏

‏إذا صمت من الشهر ثلاثًا، فصم ثلاث عشرة، وأربع عشرة وخمس عشرة‏

‏ رواه الترمذي وقال‏:‏ حديث حسن‏.‏

References1 variant
In-Book Reference
Book 8, Hadith 272
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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