1. Jaabir ibn Samurah radiyallahu anhu says, The calf of the leg of Rasoolullah sallallahu alaihe wasallam was slightly thin. His laugh was only that of a smile. Whenever I visited Rasoolullah sallallahu alaihe wasallam, I thought he used kuhl on his eyes. Whereas he had not at that time used kuhl.
2. Abdullah ibn Haarith radiyallahu anhu relates, The laugh of Sayyidina Rasoolullah sallallahu alaihe wasallam was but a smile.
That means he smiled more often. There were fewer occasions where he laughed.
3. Abu Dhar radiyallahu anhu says, Rasoolullah sallallahu alaihe wasallam said, I know that person well who will enter Jannah first and also that person who will be the last one to be taken out of Jahannam. On the Day of Qiyaamah a person will be brought forward to the court of Almighty Allah. It shall be commanded that all the minor sins of that person be put forward to him and the major sign be concealed. When the minor sins are disclosed to that person, he will accept that he had committed them, as there will be no room for refuting them. (He will begin to tremble and say in his heart that these are only the minor sins, what will happen when the major sins are exposed.) During this happening it shall be commanded that for every sin of that person he be given the ajr (thawaab-reward) of a good deed. Upon hearing this person himself will say I still have many sins left to account for, that are not seen here.
Abu Dhar radiyallahu anhu says, Rasoolullah sallallahu alaihe wasallam while narrating the words of that person began laughing until his mubarak teeth began to show. (The reason being that the person himself disclosed the very sins he was frightened of.)
4. Jabir ibn Abdullah radiyallahu anhu says, After I accepted Islam, Rasoolullah sallallahu alaihe wasallam never prohibited me from attending his assemblies. Whenever he saw me he laughed.
In the second narration it is stated that he smiled.
The second narration is mentioned because it may be known that by laughing as mentioned in the first hadith, it is meant that Sayyidina Rasoolullah sallallahu alaihe wasallam smiled. This smile is to show happiness, as to meet one cheerfully makes one feel at ease. I have observed that my elders at times met visitors with such happiness and cheerfulness that the visitor may feel that happiness is being felt by our coming.