Belief

Bukhari :: Book 1 :: Volume 2 :: Hadith 11

Narrated 'Abdullah bin 'Amr:

A man asked the Prophet , "What sort of deeds or (what qualities of) Islam are good?" The Prophet replied, 'To feed (the poor) and greet those whom you know and those whom you do not Know (See Hadith No. 27).

Source materials are from the University of Southern California MSA site
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