Sahih Muslim 3096
صحيح مسلم#3096SahihAbdullah b. 'Umar reported on the authority of his father (Allah be pleased with them):We were along with Allah's Messenger (way peace he upon him) in the morning of 'Arafa (9th of Dhu'l-Hijja). Some of us pronounced Takbir and some of us Tahlil La ilaha ill-Allah). And to those of us who pronounced Takbir, I said: By Allah, how strange it is that you did not care to ask him: What did you see Allah's Messenger (ﷺ) doing (on this occasion)?
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: 15:301