How do we know Zakat is 2.5% since it is not specifically mentioned in Quran?

A major misnomer from some people who claim to follow Quran alone is that they believe everything has to be specified verbatim in detail in the Quran otherwise it is not to be followed. This is faulty logic and a perfect lesson for this incorrect line of reasoning is in the example God provide​d us​ … Continue reading How do we know Zakat is 2.5% since it is not specifically mentioned in Quran?