Musnad Abu Ya'la al-Mawsili 109:283

Ibn Numayr narrated to us, Ya‘la narrated to us, from al-A‘mash, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "I have been commanded to fight the people until they say: 'There is no god but Allah.' If they say it, they have protected their blood and their wealth from me, except by its right, and their reckoning is with Allah."