Surah An-Nazi'at, ayah 27

ءَأَنتُمۡ أَشَدُّ خَلۡقًا أَمِ ٱلسَّمَآءُۚ بَنَىٰهَا ٢٧

A'antum ashaddu khalqan amis-samā'u banāhā

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