Sahih Muslim 821b

(48) – باب بَيَانِ أَنَّ الْقُرْآنَ عَلَى سَبْعَةِ أَحْرُفٍ وَبَيَانِ مَعْنَاهُ

(48) – The clarification that the Qur’an was revealed in seven ahruf (modes of recitation), and clarifying its meaning

This hadith has been narrated by Shu'ba with the same chain of transmitters.

وَحَدَّثَنَاهُ عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، بِهَذَا الإِسْنَادِ مِثْلَهُ .

Sahih (Authentic)