Sayyiduna Abu Dharr (Ghifari) رضي الله عنه narrates that the Messenger of Allah صلى الله عليه وسلم said: "I know well the person who will enter Paradise first, and I also know the person who will be the last to be taken out of Hell. On the Day of Resurrection, a man will be presented before Allah, and it will be said: 'Present to him his minor sins, and keep his major sins hidden from him.' Then it will be said: 'Did you do such and such deeds on such and such a day?' He will admit to those deeds and will not deny them, and he will be fearful of his major sins. Then it will be said: 'For every sin that he committed, give him a good deed in exchange.' (When he sees this situation) he will say: 'I have some other sins as well that I do not see here.'" Sayyiduna Abu Dharr رضي الله عنه says: I saw that the Messenger of Allah صلى الله عليه وسلم laughed so much that his blessed front teeth became visible.
Hadith Referenceشمائل ترمذي / باب ما جاء فى ضحك رسول الله صلى الله عليه وسلم / 228
Hadith Gradingزبیر علی زئی:صحيح
Hadith Takhrij{ « صحيح » } : «صحيح مسلم (190) ، سنن ترمذي (2596) من حديث الأعمش به وقال : ”حسن صحيح“.»