Sahih Al Bukhari – Book of To Make The Heart Tender (Ar-Riqaq)
Volumn 008, Book 076, Hadith Number 491.
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Narated By 'Abdullah bin 'Amr : The Prophet said, "A Muslim is the one who avoids harming Muslims with his tongue or his hands. And a Muhajir (an emigrant) is the one who gives up (abandons) all what Allah has forbidden."