The Prophet ﷺ said, "Every traitor will have a banner on the Day of Resurrection, and it will be said, 'This is the treachery of so-and-so.'"
عن النبي ﷺ قال: لكل غادر لواء يوم القيامة، يقال: هذه غدرة فلان.
Bukhari narrated it in "Jizya and Truces" (3186), and Muslim narrated it in "Jihad and Expeditions" (1736:12), both through the route of Shubah, from Sulayman Amash, from Abu Waail, from Ibn Masud, who related it.