'Abdullah bin 'Amr bin Al-'As (May Allah be pleased with them) reported: The Messenger of Allah (PBUH) said, "A (true) Muslim is one from whose tongue and hand the Muslims are safe; and a Muhajir (Emigrant) is he who leaves the deeds which Allah has prohibited."
Commentary
Everyone who professes Tauhid and acknowledges the Prophethood of Muhammad (PBUH), is a Muslim, but a perfect Muslim is one who has attained that high level where he does not harm any Muslim with his hand and tongue (speech). Similarly, an Emigrant is the one who abandons his homeland and relatives and goes to a place where he can easily practise the religion of Allah. But such a person is also an Emigrant who renounces all such things which are forbidden by Allah, because emigration means abandoning, whether it is abandoning of homeland or sins.