Musnad Ahmad 937:203

Abu Mu'awiyah narrated to us, Al-A'mash narrated to us, from Al-Ma'rur ibn Suwayd, from Abu Dharr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I truly know the last of the people of the Fire to exit the Fire, and the last of the people of Paradise to enter Paradise. A man will be brought, and it will be said: 'Remove his major sins and ask him about his minor ones.'" He said: "Then it will be said to him: 'You did such and such on such and such a day, and you did such and such on such and such a day.' He will say: 'O Lord, I have done things that I do not see here.'" He said: The Messenger of Allah (peace and blessings of Allah be upon him) laughed until his molars appeared. He said: "Then it will be said to him: 'For every evil deed, you have a good deed.'"