Sahih Muslim 2700
صحيح مسلم#2700SahihThis hadith has been narrated on the authority of Sufyan with the same chain of transmitters in which it is said:" Fasting of two months
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: 13:206