The Qur'an has never been changed and it can never be changed and so we should all for it. However Muslims also follow the Hadiths of the Prophet (SAW). How do we know that what has been written in these hadtith are accurate and acceptable for us to follow. Have these hadtith been changed over time? Also when these hadith were first put in writing form the Prophet did not write it nor did he say what should be written. The messages were taken in the form of A said that B said that C said that the Prophet (SAW) said...
I am only interested in a Sunni perspective.