Musnad Abu Ya'la al-Mawsili 209:112

Abu Khaythama narrated to us, Ismail bin Ibrahim narrated to us, from Ibn 'Awn, from al-Hasan, from his mother, from Umm Salamah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The rebellious group will kill Ammar."