Sahih al-Bukhari 6966
Book 90: Tricks · Narrated by `Abdullah bin `Umar
Arabic
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ عَنِ النَّبِيِّ صلى الله عليه وسلم " لِكُلِّ غَادِرٍ لِوَاءٌ يَوْمَ الْقِيَامَةِ يُعْرَفُ بِهِ ".
English translation
Narrated `Abdullah bin `Umar:The Prophet (ﷺ) said, "For every betrayer there will be a flag by which he will be recognized on the Day of Resurrection
Reference: Sahih al-Bukhari 6966, Book of Tricks. English translation by Dr. Muhammad Muhsin Khan.