﴿ نَّحْنُ خَلَقْنَٰهُمْ وَشَدَدْنَآ أَسْرَهُمْ ۖ وَإِذَا شِئْنَا بَدَّلْنَآ أَمْثَٰلَهُمْ تَبْدِيلًا ﴾

“[They will not admit to themselves that] it We who have created them and strengthened their make - and [that] if it be Our will We can replace them entirely with others of their kind.”

(We, even We, created them) i.e. the people of Mecca, (and strengthened their frame) and made their constitution strong. (And when We will, We can replace them, bringing others like them) i.e. We destroy them (in their stead) He says: if We had willed, We would have destroyed these sinful and disbelieving people and brought instead of them people who are better and more obedient.