بِسْمِ ٱللّٰهِ ٱلرَّحْمٰنِ ٱلرَّحِيمِ‎

What is the ruling on observing Nafl (optional) fast on a Friday, this includes the Ayyaam-e-Beedh (the white days) i.e. the 13th, 14th and 15th of the Islamic month?
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