Narrated Ibn Umar (may Allah be pleased with them): The Messenger of Allah (peace and blessings be upon him) said: For every betrayer, a flag will be raised on the Day of Resurrection, and it will be announced that this is the sign of the treachery of so-and-so, son of so-and-so.

Hazrat Anas bin Malik (may Allah be pleased with him) narrated that the Holy Prophet (peace and blessings of Allah be upon him) said: On the Day of Resurrection, there will be a flag for every deceitful person; that flag will be fixed (behind him), and by it he will be recognized.