They are the polytheists of Quraysh. They used to say, 'If only we had a reminder, that is, a book from the books of the earlier peoples who were given the Torah and the Gospel, we would dedicate our worship to Allah, and we would not have denied as they denied, nor would we have opposed as they opposed.' Then the reminder came to them, which is the master of reminders, and the book that is a miracle among the books, yet they disbelieved in it. And similarly, when a warner came to them, it only increased them in aversion. So they will know the consequence of their denial and what will befall them of retribution. And 'inna' is the lightened form of the heavy, and 'lam' is the differentiating letter. In that, they were saying it, affirming their words and being serious about it. So how great is the difference between the beginning of their matter and its end.