Abdullah ibn Mas’ud reported: The Messenger of Allah, peace and blessings be upon him, said, “Every treacherous person will have a banner raised over him on the Day of Resurrection. It will be said: This is the betrayal of this person!”
Source: Ṣaḥīḥ Muslim 1736
Grade: Sahih (authentic) according to Muslim
عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ قَالَ قَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ لِكُلِّ غَادِرٍ لِوَاءٌ يَوْمَ الْقِيَامَةِ يُقَالَ هَذِهِ غَدْرَةُ فُلَانٍ
1736 صحيح مسلم كتاب الجهاد والسير باب تحريم الغدر