Qur'an is Al Furqan / The Criterion between right and wrong. Good and bad.
And [mention] the Day when We will resurrect among every nation a witness over them from themselves. And We will bring you, [O Muhammad], as a witness over your nation. And We have sent down to you the Book as CLARIFICATION for all things and as GUIDANCE and MERCY and good tidings for those who have surrendered (to Allah).