Sahih Muslim
The Book of Transactions (Kitab Al-Buyu)
Book Number: 010 / Hadith Number: 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.