Surah Al-Isra 17:88

قُل لَّئِنِ ٱجْتَمَعَتِ ٱلْإِنسُ وَٱلْجِنُّ عَلَىٰٓ أَن يَأْتُوا۟ بِمِثْلِ هَـٰذَا ٱلْقُرْءَانِ لَا يَأْتُونَ بِمِثْلِهِۦ وَلَوْ كَانَ بَعْضُهُمْ لِبَعْضٍ ظَهِيرًا

Say, "If mankind and the jinn gathered in order to produce the like of this Qur’ān, they could not produce the like of it, even if they were to each other assistants."

Translation: Saheeh International

Tafsir

Say ‘Verily should mankind and jinn come together to produce the like of this Qur’ān the like thereof in terms of clarity and rhetorical excellence they could not produce the like thereof even if they backed one another’ even if one was an assistant of the other. …

Excerpt from Tafsir al-Jalalayn, commentary on 17:88, via Quran.com. The reader has the full commentary and 9 more tafsirs.