The Rites of Hajj (Kitab Al-Manasik Wa'l-Hajj)
Dawud :: Book 10 : Hadith 1810
Narrated as-Sa'ib al-Ansari:
Khalid ibn as-Sa'ib al-Ansari on his father's authority reported the Apostle of Allah (peace_be_upon_him) as saying: Gabriel came to me and commanded me to order my Companions to raise their voices in talbiyah.