Sahih Bukhari Volume 2, Book 26, Hadith Number 746.

Narated By ‘Ubaidullah bin ‘Abdullah : Ibn Abbas said, “Usama bin Zaid rode behind the Prophet from ‘Arafat to Al-Muzdalifa; and then from Al-Muzdalifa to Mina, Al-Fadl rode behind him.” He added, “Both of them (Usama and Al-Fadl) said, ‘The Prophet was constantly reciting Talbiya till he did Rami of the Jamarat-al-‘Aqaba.”