As-Saffat 37:11

فَٱسْتَفْتِهِمْ أَهُمْ أَشَدُّ خَلْقًا أَم مَّنْ خَلَقْنَآ ۚ إِنَّا خَلَقْنَـٰهُم مِّن طِينٍ لَّازِبٍۭ

Fa-is'taftihim ahum ashaddu khalqan am man khalaqnā innā khalaqnāhum min ṭīnin lāzibin

Then inquire of them, [O Muḥammad], "Are they a stronger [or more difficult] creation or those [others] We have created?" Indeed, We created them [i.e., men] from sticky clay.