Or in case that you should say: "If the Book had only been sent down to us, we should have followed its guidance better than they (did)." Now then, has come to you a clear (proof, this Quran) from your Lord, and a guide and a mercy: Then who could be more wrong than one who rejects Allah’s Signs, and turns away from it? In good time We shall punish those who turn away from Our Signs (verses), with terrifying penalty, for their turning away.