Musnad Ahmad 1118:33

Qutaybah ibn Sa'id narrated to us, he said: Rashdin ibn Sa'd narrated to me, from Humayd Abu Hani' al-Khawlani, from 'Amr ibn Malik, from Fudalah ibn 'Ubayd, that the Messenger of Allah (peace and blessings of Allah be upon him) said during the Farewell Pilgrimage: "Shall I not inform you who the Muslim is? He is the one from whose tongue and hand the Muslims are safe. And the believer is the one whom the people trust with their wealth and their lives. And the emigrant (muhajir) is the one who abandons errors and sins. And the striver (mujahid) is the one who strives against his own self in the obedience of Allah."