The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj)
Dawud :: Book 10 : Hadith 1770
Narrated Anas ibn Malik:
The Prophet (peace_be_upon_him) offered the noon prayer, and then rode on his mount. When he came to the hill of al-Bayda', he raised his voice in talbiyah.