Musnad Ahmad 30:1268

Abu Abd al-Rahman Shadhan narrated to us, Ibrahim ibn Sa'd narrated to us, from Ibn Shihab, from Ubayd Allah ibn Abd Allah, from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "There was a man who used to lend to people. He used to say to his servant: 'When you come to one in difficulty, overlook it for him, perhaps Allah will overlook it for us.' So he met Allah, and He overlooked it for him."