Surah Al-Isra, Verse 88

قُل لَّئِنِ ٱجۡتَمَعَتِ ٱلۡإِنسُ وَٱلۡجِنُّ عَلَىٰٓ أَن يَأۡتُواْ بِمِثۡلِ هَٰذَا ٱلۡقُرۡءَانِ لَا يَأۡتُونَ بِمِثۡلِهِۦ وَلَوۡ كَانَ بَعۡضُهُمۡ لِبَعۡضٖ ظَهِيرٗا٨٨

qul la-ini ij'tamaʿati l-insu wal-jinu ʿalā an yatū bimith'li hādhā l-qur'āni lā yatūna bimith'lihi walaw kāna baʿḍuhum libaʿḍin ẓahīran

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."