Sahih Muslim 1736
Sahih Muslim · Book 32: The Book of Jihad and Expeditions · The prohibition of betrayal
It has been narrated on the authority of Abdullah that the Messenger of Allah (ﷺ) said:
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا يَحْيَى بْنُ آدَمَ ، عَنْ يَزِيدَ بْنِ عَبْدِ الْعَزِيزِ ، عَنِ الأَعْمَشِ ، عَنْ شَقِيقٍ ، عَنْ عَبْدِ اللَّهِ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لِكُلِّ غَادِرٍ لِوَاءٌ يَوْمَ الْقِيَامَةِ يُعْرَفُ بِهِ يُقَالُ هَذِهِ غَدْرَةُ فُلاَنٍ " .
There will be for every perfidious person on the Day of Judgment a flag by which he will be recognised. It will be announced: Here is the breach of faith of so and so.