Sayyiduna Anas bin Malik (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) had a she-camel, al-Adba', which had never been beaten. But a Bedouin's camel outran her, and the Muslims did not like this. When he (peace and blessings be upon him) saw the displeasure on their faces, and a man even said: "O Messenger of Allah, al-Adba' has been beaten," he (peace and blessings be upon him) said: "It is the law of Allah that whatever He raises in this world, decline also comes upon it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السبق والرمي / 19753