and this quran is such that it could not be composed by any unless it be revealed from allah. it is a confirmation of the revelation made before it and a detailed exposition of the book. beyond doubt it is from the lord of the universe.
وما كان هذا القرآن أن يفترى من دون الله ولكن تصديق الذي بين يديه وتفصيل الكتاب لا ريب فيه من رب العالمين