Musnad Ahmad 1118:24

Ali ibn Ishaq narrated to us, he said: Abdullah narrated to us, he said: Layth informed us, he said: Abu Hani al-Khawlani informed me, from Amr ibn Malik al-Janbi, he said: Fudalah ibn Ubayd narrated to me, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said during the Farewell Pilgrimage: "Shall I not inform you of the believer? He is the one whom the people trust with their wealth and their lives. And the Muslim is the one from whose tongue and hand the people are safe. And the mujahid (struggler) is the one who struggles against his own self in the obedience of Allah. And the muhajir (emigrant) is the one who abandons sins and wrongdoings."