Musnad Ahmad 28:505

Abu Nu'aym narrated to us, Zakariya narrated to us, from al-Sha'bi, who said: I heard Abdullah ibn Amr saying: The Messenger of Allah, may Allah bless him and grant him peace, said: "The Muslim is the one from whose tongue and hand the Muslims are safe, and the emigrant (Muhajir) is the one who abandons what Allah has forbidden."