Musnad Abu Ya'la al-Mawsili 42:240

Abu Khaythama narrated to us, Abd al-Samad narrated to us, al-Mustamir narrated to us, Abu Nadra narrated to us, from Abu Sa’id al-Khudri, who said: The Messenger of Allah (peace be upon him) said: "For every treacherous person there is a banner on the Day of Resurrection, raised for him according to the extent of his treachery. And beware, there is no treacherous person greater in treachery than a leader of the general public."