Musannaf Ibn Abi Shayba 19:862

Abu Bakr narrated to us, he said: Hafs bin Ghiyath narrated to us, from al-A’mash, from Abu Sufyan, from Jabir, and from Abu Salih, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I have been commanded to fight the people until they say: 'There is no god but Allah.' So if they say it, they have protected their blood and their wealth from me, except for its right, and their reckoning is with Allah."