As Saffat Ayah 11

فَٱسْتَفْتِهِمْ أَهُمْ أَشَدُّ خَلْقًا أَم مَّنْ خَلَقْنَآ‌ۚ إِنَّا خَلَقْنَـٰهُم مِّن طِينٍ لَّازِبِۭ ١١ So ask them ?O Prophet?, which is harder to create: them or other marvels of Our creation? Indeed, We created them from a sticky clay.