عَنْ أَبِي مُوسَى قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا بَعَثَ أَحَدًا مِنْ أَصْحَابِهِ فِي بَعْضِ أَمْرِهِ قَالَ: «بَشِّرُوا وَلَا تُنَفِّرُوا وَيَسِّرُوا وَلَا تُعَسِّرُوا»

Ibn ‘Umar reported God’s Messenger as saying, “The perfidious one will have a standard set up for him on the day of resurrection, and announcement will be made that this is the perfidy* of so and so, the son of so and so.” (Bukhari and Muslim.)* This is explained as meaning the sign, result, or punishment of his perfidy.