Surah An-Nazi'at 79:27

ءَأَنتُمْ أَشَدُّ خَلْقًا أَمِ ٱلسَّمَآءُ ۚ بَنَىٰهَا

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

Translation: Saheeh International

Tafsir

Are you read a-antum pronouncing both hamzas or by substituting an alif for the second one not pronouncing it and inserting an alif between the one not pronounced and the former or without this insertion namely you the deniers of the Resurrection harder to create or the heaven which He has built? harder to create …

Excerpt from Tafsir al-Jalalayn, commentary on 79:27, via Quran.com. The reader has the full commentary and 9 more tafsirs.