A Muslim is the One Who Avoids Harming Muslims

Narrated ‘Abdullah bin ‘Amr (Radiyallahu `anhu), the Prophet (Sallallaahu `alayhi wa sallam) 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.”

(Bukhari: Volume 1, Book 2, Number 9)