‘Abdallah b. Shaqiq said that when he asked ‘A'isha whether the Prophet used to fast a whole month she replied, "I never knew him to fast a whole month except Ramadan, nor to refrain from fasting some part of every month till he died." Muslim transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب الصوم / 2037
Hadith Gradingالألبانی:صَحِيح | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه مسلم (173 / 1156)»