Sura al-Ṣaffāt 37:11

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

fa-istaftihim a-hum ashaddu khalqan am man khalaqnā innā khalaqnāhum min ṭīnin lāzibin

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!