Abu Rafi' (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) borrowed a young camel from a man. When camels of zakah came to him (peace and blessings be upon him), he (peace and blessings be upon him) ordered me: "that I should repay him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7364