فَاسْتَفْتِهِمْ أَهُمْ أَشَدُّ خَلْقًا أَم مَّنْ خَلَقْنَا إِنَّا خَلَقْنَاهُم مِّن طِينٍ لَّازِبٍ
[37:11]
Then ask them whether they are stronger in creation or those (others) whom We have created. Surely We created them of firm clay.
Just ask their opinion: are they the more difficult to create, or the (other) beings We have created? Them have We created out of a sticky clay!
Then ask them (O Muhammad): Are they stronger as a creation, or those (others) whom we have created? Lo! We created them of plastic clay.