Volume 1, Book 2, Number 11: 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 Narrated 'Abdullah bin 'Amr: whom you do not Know (See Hadith No. 27).
Volume 1, Book 2, Number 12: Narrated Anas: The Prophet said, "None of you will have faith till he wishes for his (Muslim) brother what he likes for himself." Volume 1, Book 2, Number 13: Narrated Abu Huraira: "Allah's Apostle said, "By Him in Whose Hands my life is, none of you will have faith till he loves me more than his father and his children."