Sahih Muslim 819
Sahih Muslim · Book 6: The Book of Prayer - Travellers · The clarification that the Qur’an was revealed in seven ahruf (modes of recitation), and clarifying its meaning
وَحَدَّثَنَاهُ عَبْدُ بْنُ حُمَيْدٍ ، أَخْبَرَنَا عَبْدُ الرَّزَّاقِ ، أَخْبَرَنَا مَعْمَرٌ ، عَنِ الزُّهْرِيِّ ، بِهَذَا الإِسْنَادِ .
This hadith has been narrated by Zuhri with the same chain of trans- mitters.