Answer:
(Fatwa: 2107/1937=D/1429)
It is Sunnah to keep fast on the occasion of Ashurah, while the other fasts (mentioned above) are Mustahab. The virtue of these fasts is mentioned in the Hadith. Likewise, keeping six fasts in Shawwal after Eid is also a matter of great reward. Also, there are Hadith describing the virtue of Sawm Dawood i.e. keeping fast every other day.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
