Sahih Al Bukhari Hadith Number 970

Narrated Muhammad bin Abi Bakr Al-Thaqafi: While we were going from Mina to `Arafat, I asked Anas bin Malik, about Talbiya, “How did you use to say Talbiya in the company of the Prophet?” Anas said: “People used to say Talbiya and their saying was not objected to and they used to say Takbir and that was not objected to either. “

13  The Two Festivals (Eids)
Hadith number 970
Volume no 2
Chapter: 12 (To say Takbir on the days of Mina and while proceeding to Arafat)