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