The Messenger of Allah (sallAllaahu ‘alayhi wa sallam.) says, “The rights a Muslim has over another Muslim:
1- When he meets him,► Greet him,
2- When he gives him an invitation,► Accept it.
3- When he asks him for advice,► Give him good counsel.
4- When he sneezes and praises Allah,► Wish him mercy.
5- When he is ill,► Visit him.
6- When he dies,► Accompany him (to the funeral).”
[Bukhari; Adab Al-Mufrad, 452 #991]