Sahih Al Bukhari – Book of Belief
Volumn 001, Book 002, Hadith Number 011.
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Narated By 'Abdullah bin 'Amr RA : A man asked the Prophet PBUH, "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).
which of these deeds you do daily?