From Sahih Muslim (Hadith 3095):
Abdullah b. 'Umar reported on the authority of his father (Allah be pleased with them). He said:As we proceeded in the morning along with AUbs Messenger (ﷺ) from Mina to 'Arafat, some of us prounced Talbiya, and some pronounced Takbir (Allah-o-Akbar)
Reference: Muslim 3095