Amatul Rahmân Omer:
Their predecessors had also cried lies (to the Prophets of their time). And these (Makkans) have not attained (even) a tenth of that (resources of wealth and strength) which We had given their predecessors, yet they cried lies to My Messages so (let these see) how (terrible) was the change I brought about and how (tremendous) was (the result of) My disapproval.
