Abu Hurayrah reported the prophet(p.b.u.h ) as saying : " six are the rights of A Muslim over another Muslim ." it was said to him ."Allah's messenger , what are the six rights ?" thereupon he said :"when you meet him,offer him Salam ;when he invites you to a feast , accept it .when he seeks your counsel,give him and when he sneeze and says :"al-hamdu lillah, you say 'yarhamuka Allah '( May Allah show mercy to you ); and when he falls ill , visit him: and when he dies ,follow his bier."