The Messenger of Allah ﷺ said, "Every traitor will have a banner on the Day of Resurrection by which it will be said, 'This is the treachery of so-and-so.'"
حدثنا حسن حدثنا شيبان عن يحيى حدثني رجل أنه
قال رسول الله ﷺ لكل غادر لواء يوم القيامة يقال هذه غدرة فلان
Its isnad is sahih. It is a repetition of 5192, and see 5378.