45.The statement that it is 'a confirmation of the revelation made before it' underscores that the Qur'an lays no claim of introducing anything novel, of coming forth with any innovation at variance with the fundamental teachings already communicated to man through the Prophets (peace be on them). The Qur'anic claim merely consists of confirming and authenticating those teachings. Had the Qur'an been the product of the imagination of the founder of an altogether new religion, the outcome of a creative brain, it would have borne traces of novelty in order to emphasize its distinctiveness.
The second part of the statement, namely that the Qur'an is a 'detailed exposition of the Book' is equally significant. What this means is that the Qur'an elaborates those fundamental teachings which constitute the core and essence of all the scriptures (al-Kitab); that is, those teachings which have been sufficiently elucidated in the Qur'an so that they might be grasped by people and penetrate their hearts; and additionally, it has been shown how those teachings could be applied to practical life.