(83) باب كَيْفَ يَصُومُ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ لِلْخَبَرِ فِي ذَلِكَ .
It was narrated from Hunaidah bin Khalid, from his wife, from one of the wives of the Prophet, that:
the Messenger of Allah used to fast nine days of Dhul-Hijjah, the day of 'Ashura', and three days of each month: The first Monday of the month, and two Thursday. (ES)
Reference (ES): Sunan an-Nasa'i 2417 (ES)
In-book reference (ES): Book 22, Hadith 328 (ES)
English translation (ES): Vol. 3, Book 22, Hadith 2419 (ES)