Mishkat al-Masabih #1968
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أُمِّ سَلَمَةَ قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَأْمُرُنِي أَنْ أَصُومَ ثَلَاثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ أَوَّلُهَا الِاثْنَيْنِ وَالْخَمِيس. رَوَاهُ أَبُو دَاوُد وَالنَّسَائِيّ
Umm Salama said that God’s messenger used to command her to fast three days every month beginning with Monday or Thursday.
Abu Dawud and Nasa’i transmitted it.
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About Mishkat al-Masabih
This hadith is #1968 from Mishkat al-Masabih, in the Book of Fasting.