Mishkat al-Masabih #1966
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَصُومُ مِنْ غُرَّةِ كُلِّ شَهْرٍ ثَلَاثَةَ أَيَّامٍ وَقَلَّمَا كَانَ يفْطر يَوْم الْجُمُعَةَ. رَوَاهُ التِّرْمِذِيُّ وَالنَّسَائِيُّ وَرَوَاهُ أَبُو دَاوُدَ إِلَى ثَلَاثَة أَيَّام
‘Abdallah b. Mas'ud said that God’s messenger used to fast the first three days every month, and he would seldom break his fast on a Friday.
Tirmidhi and Nasa’i transmitted it, and Abu Dawud transmitted up to “three days every month.”
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About Mishkat al-Masabih
This hadith is #1966 from Mishkat al-Masabih, in the Book of Fasting.