Abu Bakr al-Hanfi عبد الكبير بن عبد المجيد- أبو بكر الحنفي · The Book of Horses, Races and Shooting

"The Messenger of Allah had a she-camel called Al-'Adba' which could not be beaten. One day a Bedouin came on a riding-camel and beat her (in a race). The Muslims were upset by that, and when he saw the expressions on their faces they said: 'O Messenger of Allah, Al-'Adba' has been beaten.' He said: 'It is a right upon Allah that nothing is raised in this world except He lowers it.'"