They have no true respect of God when they say, "God has not sent anything to a mortal being." (Muhammad), tell them, "Who revealed the Book containing a light and guidance for the people which Moses brought? You wrote down only some parts of the original on paper and hid much, even after having learnt from it, that which neither you nor your fathers knew." Tell them, "God has (revealed the Quran)," and then leave them alone to pursue their useless investigations.