The Book of Fasting
22/84. Chapter:
Mentioning The Differences Reported From Musa Bin Talhah In The Narration About Fasting three days of each month
Sunan an-Nasai
أَخْبَرَنَا عَمْرُو بْنُ يَزِيدَ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنِ الأَعْمَشِ، قَالَ سَمِعْتُ يَحْيَى بْنَ سَامٍ، عَنْ مُوسَى بْنِ طَلْحَةَ، قَالَ سَمِعْتُ أَبَا ذَرٍّ، بِالرَّبَذَةِ قَالَ قَالَ لِي رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا صُمْتَ شَيْئًا مِنَ الشَّهْرِ فَصُمْ ثَلاَثَ عَشْرَةَ وَأَرْبَعَ عَشْرَةَ وَخَمْسَ عَشْرَةَ " .
It was narrated that Musa bin Talhah said: "I heard Abu Dharr, at Ar-Rabadhah, saying: 'The Messenger of Allah said: if you want to fast at any time during the monthm then fast on the thirteenth, fourteenth and fifteenth."'
Reference : Sunan an-Nasa'i 2424In-book reference : Book 22, Hadith 335English translation : Vol. 3, Book 22, Hadith 2426