The Book of Transactions (Kitab Al-Buyu`)
Muslim :: Book 10 : Hadith 3900
Abu Huraira (Allah be pleased with him) reported: There came a person demanding a camel from Allah's Messenger (may peace be upon him). He (the Holy Prophet) said: Give him (the camel) of that age or of more mature age, and said: Best among you is one who is best in clearing off the debt.