Before the fasting of Ramadan become obligatory,Muslims were order to fast on wh -

سورہ ـــــــــــــــــــــــــــــــــــ میں اللہ تعالی کے فرمان کے مطابق ہر انسان خسارے میں ہے لیکن…

Before the fasting of Ramadan become obligatory,Muslims were order to fast on which day?