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