Ash-Sha'bi said, "A man came to 'Abdullah ibn 'Amr when there
were some people sitting with him. He stepped over them in order to reach
him. They stopped him and 'Abdullah said, 'Leave the man.' He approached
until he sat with him and then said, 'Tell me something which you heard
from the Messenger of Allah, may Allah bless him and grant him peace.'
'Abdullah said, 'I heard the Messenger of Allah, may Allah bless him and
grant him peace, say, "A Muslim is the one from whose tongue and hand the
Muslims are safe. An emigrant (muhajir) is someone who abandons what Allah
has forbidden."'"