The Book of Fasting
13/36. Chapter:
It is recommended to fast three days of every month, and to fast on the days of 'Arafah and 'Ashura', and to fast on Mondays and Thursdays
Sahih Muslim
وَحَدَّثَنَاهُ عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي ح، وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا شَبَابَةُ، ح وَحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا النَّضْرُ بْنُ شُمَيْلٍ، كُلُّهُمْ عَنْ شُعْبَةَ، بِهَذَا الإِسْنَادِ.
This hadith has been narrated by Shu'ba with the same chain of transmitters.
Reference : Sahih Muslim 1162cIn-book reference : Book 13, Hadith 254USC-MSA web (English) reference : Book 6, Hadith 2604