Riyad us Saliheen: Hadith 1369

The Messenger of Allah (ﷺ) said, "There was a person who used to loan money to the people and he used to say to his servant: 'When an insolvent person comes to you, show him leniency so that Allah may forbear our faults.' So when he met Allah (i.e., when he died), Allah forgave him."

[Al-Bukhari and Muslim].