A real study about Islamic sources & Hadiths :

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The Quran was put together years after Mohammed died from fragments written on parchments, pieces of bone and from memorised oral accounts it wasn't straight from Mohammeds mouth to paper it was assembled and collected together from a mishmash much like the Bible. But I'd give it the benefit of the doubt that it represents what Mohammed said the same as I would regard the hadith as what Mohammed did. There's no double standard there.