Sahih Muslim 2052
صحيح مسلم#2052SahihIbn 'Umar reported that the Messenger of Allah (ﷺ), Abu Bakr and 'Umar used to observe the two 'Id prayers before the sermon
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: 8:8