ءَأَنتُمْ أَشَدُّ خَلْقًا أَمِ ٱلسَّمَآءُ ۚ بَنَىٰهَا

Aantum ashaddu khalqan ami assamaobanaha

Are you a more difficult creation or is the heaven? He [i.e., Allāh] constructed it.