Sahih Bukhari Volume 004, Book 056, Hadith Number 687.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 56. Virtues and Merits of the Prophets (PBUH) and his Companions
Narated By Abu Huraira : Allah's Apostle said, "A man used to give loans to the people and used to say to his servant, 'If the debtor is poor, forgive him, so that Allah may forgive us.' So when he met Allah (after his death), Allah forgave him."