Challenge of the Qur'an ( 28 : 49 - 50)

Say, "Then bring a scripture from Allah which is more guiding than either of them that I may follow it, if you should be truthful."
But if they do not respond to you – then know that they only follow their [own] desires. And who is more astray than one who follows his desire without guidance from Allah? Indeed, AllŒh does not guide the wrongdoing people.
Quran ( 28 : 49 - 50)