Sahih Muslim
Sahih Muslim 821 b
The clarification that the Qur’an was revealed in seven ahruf (modes of recitation), and clarifying its meaning
Arabic hadith text
وَحَدَّثَنَاهُ عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، بِهَذَا الإِسْنَادِ مِثْلَهُ .
Translation
This hadith has been narrated by Shu'ba with the same chain of transmitters.