"There was a slenderness in the legs of Allah’s Messenger (Allah bless him and give him peace), and his laugh always took the form of a joyful smile, so when I looked at him, I said: 'His eyes are blackened [with kohl], though and he is not black-eyed'!”

"I have not seen anyone with a more cheerful countenance than Allah's Messenger (Allah bless him and give him peace)!"

“The laughter of Allah’s Messenger (Allah bless him and give him peace) was nothing but a joyful smile.”

“Allah’s Messenger said (Allah bless him and give him peace): "I surely know the first man who will enter the Garden of Paradise, and the last man who will emerge from the Fire of Hell. The man will be brought forth on the Day of Resurrection, and the command will be given: “Show him his minor sins, and let his major sins be hidden from him!” He will therefore be told: “On such-and-such a day, you committed such-and-such and such-and-such sins!” He will acknowledge [his sins] and not disavow them and he will be fearful of those sins that are major offenses, so the command will be given: “In place of every bad deed he committed, grant him a good deed!” He will therefore say: “I am guilty of sins that I do not see here!” Abu Dharr said: “I saw Allah’s Messenger (Allah bless him and give him peace) smile so broadly that his molar teeth showed!”

“Allah’s Messenger (Allah bless him and give him peace) did not shun me from the time when I embraced Islam, and he never saw me without laughing.”

Same as the above hadith.

"Allah’s Messenger said (Allah bless him and give him peace): “I am well aware of the last person to emerge from the Hellfire. After crawling out, he will be told: ‘Go and enter the Garden of Paradise!’ He will therefore enter the Garden of Paradise, but he will find that the people have occupied the abodes, so he will return and say: ‘O my Lord, the people have occupied the abodes!’ He will therefore be asked: ‘Do you remember the time you were in?’ He will say: ‘Yes,’ so he will be told: ‘Make a wish!’ He will make a wish, whereupon he will be told: ‘You have what you wished for, and this world ten times over!’ He will then say: ‘Are you, the Sovereign, mocking me?”’ He ['Abdu’llah ibn Mas'ud] said: “I saw Allah’s Messenger (Allah bless him and give him peace) grin so broadly that his molar teeth showed!”

"I was present when 'Ali (may Allah be well pleased with him) had an animal brought for him to ride. When he placed his foot in the stirrup, he said: “In the Name of Allah [Bismillah],” and when he settled on its back, he said: “Praise be to Allah!” Then he said: “Glory be to the One who has placed this at our disposal, for we would not have been equal to the task [Subhanalladhi sakhkhara la-na hadha wa ma kunna la-hu muqrinin], and to our Lord we are surely returning [wa inna ila Rabbina la-munqalibun]. (Al-Qur'an;43:13-14)Then he said: “Praise be to Allah,” three times, and: “Allah is Supremely Great,” three times, then: “Glory be to You! I have wronged myself, so forgive me, for no one forgives sins but You!” Then he laughed, so I said to him: “What has made you laugh, O Commander of the Believers?” He said: “I saw Allah’s Messenger (Allah bless him and give him peace) do just as I did now, after which he laughed, so I said: "What has made you laugh, O Messenger of Allah?" He replied: ‘Your Lord surely marvels at His servant when he says: “My Lord, forgive me my sins, knowing that no one but He forgives sins'!”

“Sa'd [Ibn Abi Waqqas] said: ‘I had seen the Prophet (Allah bless him and give him peace) laugh at the Battle of the Trench, so hard that his molar teeth became apparent.’ I said: ‘How was his laughter?’ He said: ‘There was a man holding a shield while Sa'd was shooting, and the man was saying such-and-such and such-and-such, with the shield covering his forehead. Sa'd therefore aimed an arrow at him and shot it when he raised his head, so it did not miss this part of him — meaning his forehead — and the man toppled over and kicked up his foot. The Prophet (Allah bless him and give him peace) then laughed so much that his molar teeth became apparent.’ I asked: ‘What made him laugh?’ He replied: ‘What he did to the man!”