(83) باب كَيْفَ يَصُومُ ثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ وَذِكْرِ اخْتِلاَفِ النَّاقِلِينَ لِلْخَبَرِ فِي ذَلِكَ .
It was narrated that Umm Salamah said:
"The Messenger of Allah used to enjoin fasting three days: The first Thursday, and Monday and Monday." (DE)
Reference (DE): Sunan an-Nasa'i 2419 (DE)
In-book reference (DE): Book 22, Hadith 330 (DE)
English translation (DE): Vol. 3, Book 22, Hadith 2421 (DE)