Messenger of Allah ﷺ said, "A flag will be fixed on the Day of Resurrection for every betrayer, and it will be announced (publicly in front of everybody), 'This is the betrayal (perfidy) so-and-so, the son of soand- so."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِنَّ الْغَادِرَ يُنْصَبُ لَهُ لِوَاءٌ يَوْمَ الْقِيَامَةِ فَيُقَالُ هَذِهِ غَدْرَةُ فُلاَنِ بْنِ فُلاَنٍ  

The Prophet ﷺ said, ''Every betrayer will have a flag on the Day of Resurrection" One of the two subnarrators said that the flag would be fixed, and the other said that it would be shown on the Day of Resurrection, so that the betrayer might be recognized by it.  

عَنِ النَّبِيِّ ﷺ قَالَ لِكُلِّ غَادِرٍ لِوَاءٌ يَوْمَ الْقِيَامَةِ قَالَ أَحَدُهُمَا يُنْصَبُ وَقَالَ الآخَرُ يُرَى يَوْمَ الْقِيَامَةِ يُعْرَفُ بِهِ  

The Prophet ﷺ said, "He who lets the people hear of his good deeds intentionally, to win their praise, Allah will let the people know his real intention (on the Day of Resurrection), and he who does good things in public to show off and win the praise of the people, Allah will disclose his real intention (and humiliate him).  

قَالَ النَّبِيُّ ﷺ وَلَمْ أَسْمَعْ أَحَدًا يَقُولُ قَالَ النَّبِيُّ ﷺ غَيْرَهُ فَدَنَوْتُ مِنْهُ فَسَمِعْتُهُ يَقُولُ قَالَ النَّبِيُّ ﷺ: «مَنْ سَمَّعَ سَمَّعَ اللَّهُ بِهِ، وَمَنْ يُرَائِي يُرَائِي اللَّهُ بِهِ۔»