The clarification that the Qur’an was revealed in seven ahruf (modes of recitation), and clarifying its meaning
حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، وَعَبْدُ بْنُ حُمَيْدٍ، قَالاَ أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، كَرِوَايَةِ يُونُسَ بِإِسْنَادِهِ .
This hadith has been transmitted by Zuhri.