Yahya related to me from Malik, from Yahya ibn Said, that Umaribn Abd alAziz was once going from Mina (to Arafa) on the day of Arafaand heard the takbir being said loudly, so he sent the guard to shoutout to the people, "O people, you should be saying the talbiya."
USC-MSA web (English) reference: Book 20, Hadith 49
Arabic reference: Book 20, Hadith 754