Musnad Abu Ya'la al-Mawsili 243:41

Abu Kurayb narrated to us, Yahya ibn Burayd narrated to us, he said: My father narrated to me, from Abu Burdah, from Abu Musa, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "He is not of us who bears arms against us."