Sayyiduna Ammar bin Yasir (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) that he (peace and blessings be upon him) said: "Whoever was two-faced in this world will have two tongues of fire on the Day of Resurrection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21157