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Ubaidullah b. Mu'adh reported it on the authority of his father Shu'ba with the same chain of transmitters and he made this addition. He made a mention of these two names but I do not know whose name he mentioned first.
حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، بِهَذَا الإِسْنَادِ وَزَادَ قَالَ شُعْبَةُ
بَدَأَ بِهَذَيْنِ لاَ أَدْرِي بِأَيِّهِمَا بَدَأَ ‏.‏

Classification

Sahih (Authentic)

References

• Sahih Muslim, 2464f
• Sahih Muslim, Vol. 6, Book of the Merits of the Companions, Hadith 6028
• Sahih Muslim, Book of the Merits of the Companions, Hadith 6028