Musannaf Ibn Abi Shayba 27:499

Abu al-Jawwab narrated to us, from Yunus ibn Abi Ishaq, from Zayd ibn Yuthay', from Abu Dharr, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "They shall certainly desist, or I shall certainly send to them a man like myself, who will execute my command among them, and he will kill the combatants and take the offspring captive."