‏الجهاد والسير‏ : Hadeeth No:4309 It is narrated on the authority of Abu Sa'id that the Messenger of Allaah (sallAllaahu alayhi wa sallam) said: On the Day of Judgment there will be a flag fixed behind the buttocks of every person guilty of the breach of faith....

‏الجهاد والسير‏ : Hadeeth No:4303 This hadith has been narrated by another chain of transmitters on the authority of the same narrator, with the wording: Allaah will set up a flag for every person guilty of breach of faith on the Day of Judgment, and it will be announced: Look, this is the perfidy of so and so....