Sahih Muslim 1341
صحيح مسلم#1341SahihWarrad, the scribe of Mughira b. Shu'ba, reported:Mu'awiya wrote to Mughira (the contents) of the hadith as transmitted by Mansur and A'mash
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:178