Were People Aware Of And Used To Observe Fasts Before Quran?
Roza just like prayer, is a sunnah of the prophets. It was obligatory in every shariah of every prophet. The Prophet Muhammad revived this sunnah and we know from sunnah that it is obligatory with all the related details. Quran at times mentions a sunnah and comments for some reasons. otherwise, it is actually sunnah which is the source of these rituals.