صَحِيحُ مُسْلِمٍ
Sahih Muslim 1156 d
The Book of Fasting
The Prophet's Fasts at times other than Ramadan; and it is recommended to ensure that no month is free of fasting
وَحَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ، قَالَ سَأَلْتُ عَائِشَةَ - رضى الله عنها - بِمِثْلِهِ وَلَمْ يَذْكُرْ فِي الإِسْنَادِ هِشَامًا وَلاَ مُحَمَّدًا .
A hadith like this has been narrated on the authority of Abdullah b. Shaqiq but in the chain of transmitters no mention is made of Hisham and Muhammad.
Sahih Muslim, 1156 dSahihصحيح