كَمَا بَدَأْنَآ أَوَّلَ خَلْقٍ نُّعِيدُهُ وَعْداً عَلَيْنَآ إِنَّا كُنَّا فَـعِلِينَ
(As We began the first creation, We shall repeat it. (It is) a promise binding upon Us. Truly, We shall do it.) means, this will inevitably come to pass on the Day when Allah creates His creation anew. As He created them in the first place, He is surely able to re-create them. This must inevitably come to pass because it is one of the things that Allah has promised, and He does not break His promise. He is able to do that. Because He says: