Narrated Ibn 'Umar: The Prophet said, "For every betrayer (perfidious person), a flag will be raised on the Day of Resurrection, and it will be announced (publicly) 'This is the betrayal (perfidy) of so-and-so, the son of so-and-so.' "
— Sahih Bukhari, Volume 8, Book 73: Good Manners and Form (Al-Adab), Hadith #196
