Yahya related to me from Malik from Zayd ibn Aslam from Ata ibnYasar that Abu Rafi, the mawla of the Messenger of Allah, may Allahbless him and grant him peace, said, "The Messenger of Allah, mayAllah bless him and grant him peace, borrowed a young camel and thenthe camels of sadaqa came to him." Abu Rafi said, "He ordered me torepay the man his young camel. I said, 'I can only find a good camelin its seventh year in the camels.' The Messenger of Allah, may Allahbless him and grant him peace, said, 'Give it to him. The best ofpeople are those who discharge their debts in the best manner.' "
USC-MSA web (English) reference: Book 31, Hadith 90
Arabic reference: Book 31, Hadith 1376