Book 20, Number 20.7.29:

Yahya related to me from Malik from Hisham ibn Urwa from his father that the Messenger of Allah, may Allah bless him and grant him peace, used to pray two rakas in the mosque at Zhu 'l-Hulayfa, and then, when he had got on to his camel and it had stood up, he would begin doing talbiya.