Mishkat al-Masabih 18 The Offices of Commander and Qadi كتاب الإمارة والقضاء 65

وَعَنْ أَنَسٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لِكُلِّ غَادِرٍ لِوَاءٌ يومَ القيامةِ يُعرَفُ بِهِ»

Anas reported the Prophet as saying, “Every perfidious one will have a standard on the day of resurrection by which he will be recognized.” (Bukhari and Muslim.)