Characteristics of Islam

Narrated by 'Abdullah bin 'Amr (radiyAllaahu 'anhu): A man asked the Prophet (sallAllaahu 'Alaihi Wa sallam), "What sort of deeds or (what qualities of) Islam are good?" The Prophet (SallAllaahu 'Alaihi Wa sallam) replied;'To feed (the poor) and, greet those whom you know and those whom you do not Know.'

[Bukhari 11 &  27]