Abu Dawud
The Rites of Hajj
Book Number: 004 / Hadith Number: 1961
Narated By Umm Jandab al-Azdiyyah : I saw the Apostle of Allah (pbuh) near the Jamrat al-Aqabah (the third or last pillar) riding (on a camel) and I saw a pebble between his fingers. He threw the pebbles and the people also threw (stones at the Jamrah).