Sahih Al Bukhari – Book of Belief
Volumn 001, Book 002, Hadith Number 009.
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Narated By 'Abdullah bin 'Amr RA: The Prophet PBUH said, "A Muslim is the one who avoids harming Muslims with his tongue and hands. And a Muhajir (emigrant) is the one who gives up (abandons) all what Allah has forbidden."