Chapter 16: The Book of Pilgrimage
Abdullah 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)?
Sahih Muslim 1284b