Musnad Abu Ya'la al-Mawsili 122:5

Abu Bakr ibn Abi Shaybah narrated to us, from Humayd and Mus'ab, that they heard Anas informing the people: That he heard the Prophet, may Allah bless him and grant him peace, while he was at al-Bayda' and was riding behind Abu Talhah, pronouncing the talbiyah for an 'Umrah and a Hajj.