'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.
Related hadith on this topic
Explanation & Benefits
Maulana Ataullah Sajid
Benefits and Issues:
➊
After pledging allegiance to the legitimate Islamic ruler and caliph, breaking that allegiance is a very grave sin.
➋
On the Day of Resurrection, such a criminal will face great disgrace and humiliation.
➌
A flag is something that can be seen from afar; therefore, the rebellion against the legitimate caliph will be widely publicized.
People will see from a distance and say, “This person was a traitor. This flag is the proclamation of his treachery.”
➍
The punishment for some sins will be given in the plain of resurrection (mahshar) itself, even before entering Hell.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 2872