Sahih Bukhari Volume 2, Book 26, Hadith Number 616.

Narated By ‘Ubaidullah bin ‘Abdullah : Ibn Abbas’ said, “Usama rode behind Allah’s Apostle from ‘Arafat to Al-Muzdalifa; and then Al-Fadl rode behind Allah’s Apostle from Al-Muzdalifa to Mina.” Ibn Abbas added, “Both of them said, ‘The Prophet kept on reciting Talbiya till he did the Rami of Jamrat-al-‘Aqaba.'”