The Messenger of Allah ﷺ said, "When Allah gathers the first and the last on the Day of Resurrection, a banner will be raised for every traitor, and it will be announced, 'This is the treachery of so-and-so, son of so-and-so.'"
حدثنا محمد بن عبيد حدثنا عبيد الله عن نافع
قال رسول الله ﷺ إذا جمع الله الأولين والآخرين يوم القيامة رفع لكل غادر لواء فقيل هذه غدرة فلان بن فلان
Its isnad is sahih, and it is a longer version of 4648. It will also come again in the story at 5088.