Narrated Muhammad bin 'AbdurRahman bin Nawfal Al-Qurashi:
I asked 'Urwa bin Az-Zubair (regarding the Hajj of the Prophet ). 'Urwa replied, "Aisha narrated, 'When the Prophet reached Mecca, the first thing he started...
O Allah, I ask You for the goodness of her and the goodness upon which You have created her, and I seek refuge in You from the evil of her and from the evil upon which You have created her.
Info: (If you purchase a camel then take hold of the top of its hump and say the same). Abu Dawud 2/248 and Ibn Majah 1/617. See also Al-Albani, Sahih Ibn Majah 1/324.