﴿ قُل لَّئِنِ ٱجْتَمَعَتِ ٱلْإِنسُ وَٱلْجِنُّ عَلَىٰٓ أَن يَأْتُوا۟ بِمِثْلِ هَٰذَا ٱلْقُرْءَانِ لَا يَأْتُونَ بِمِثْلِهِۦ وَلَوْ كَانَ بَعْضُهُمْ لِبَعْضٍۢ ظَهِيرًۭا ﴾

“Say: "If all mankind and all invisible beings would come together with a view to producing the like of this Qur'an, they could not produce its like even though they were to exert all their strength in aiding one another!"”

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. This verse was revealed as a refutation of their statement ‘If we wish we can speak the like of this’ Q. 831.