Shama-il Tirmidhi Chapter 34, Hadith Number 5 (220).

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.

Commentary
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.