What Is The Topic Of Religion?
Quran has mentioned in many places about Tazkiya and its essence in religion. We know general meaning of Tazkiya and its application in many scenarios as well, irrespective of the Quran. But when you analyze Islamic Sharia directives in different domains of life, their relationship with Tazkiya becomes very clear. Both Tazkiya and Islamic Sharia (i.e. its application) are mentioned in Quran, there is no circular reasoning. We are simply elaborating and understanding their relationship.