Sahih al-Bukhari 3188

Arabic

حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ، حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ ‏ "‏ لِكُلِّ غَادِرٍ لِوَاءٌ يُنْصَبُ لِغَدْرَتِهِ ‏"‏‏.‏

English translation

Narrated Ibn `Umar:The Prophet (ﷺ) said, "Every betrayer will have a flag which will be fixed on the Day of Resurrection, and the flag's prominence will be made in order to show the betrayal he committed

Reference: Sahih al-Bukhari 3188, Book of Jizyah and Mawaada'ah. English translation by Dr. Muhammad Muhsin Khan.