It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "For every betrayer there is a banner on the Day of Resurrection, which will be set up for him, and by which he will be recognised."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16634