Abdullah reported Allah's Prophet (ﷺ) as saying:There will be a flag for every perfidious person on the Day of Judgment, and it would be said: Here is the perfidy of so and so

This hadith has been narrated on the authority of Shu'ba with a slight variation of wording

It has been narrated on the authority of Abdullah that the Messenger of Allah (ﷺ) said:There will be for every perfidious person on the Day of Judgment a flag by which he will be recognised. It will be announced: Here is the breach of faith of so and so