They estimate not the power of Allah by its true measure (or worth) when they say, "Allah has never revealed anything to a mortal." Say, "Who revealed the Book wherewith Moses came, a light and a guidance unto men? You put it on papers which you show, though you hide much; and you are taught by it that which you knew not, neither you nor your fathers." Say, "Allah," then leave them in their play (vain disputation).