this quran is not such as could be composed by anyone but god. it confirms what has been revealed before and is an exposition of law. without any doubt its from the lord of all the worlds.
وما كان هذا القرآن أن يفترى من دون الله ولكن تصديق الذي بين يديه وتفصيل الكتاب لا ريب فيه من رب العالمين