The Book of Transactions (Kitab Al-Buyu`)
Muslim :: Book 10 : Hadith 3793
Abu Huraira (Allah be pleased with him) reported Allah's Messenger (may peace be upon him) as saying: There was a person who gave loans to the people and said to his men: When an insolvent comes to you show him leniency that Allah may overlook our (faults). So when he met Allah, He overlooked his faults (forgave him).