The clarification that the Qur’an was revealed in seven ahruf (modes of recitation), and clarifying its meaning Sahih Muslim 819 b
وَحَدَّثَنَاهُ عَبْدُ بْنُ حُمَيْدٍ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ
Translation
This hadith has been narrated by Zuhri with the same chain of trans- mitters.