Musnad Abu Ya'la al-Mawsili 105:36

Narrated to us Abdullah ibn Amir ibn Zurarah, narrated to us Sharik, from al-Rukin, from Ibn Hanzalah, from Ammar, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever is two-faced in this world, he will have two tongues of fire on the Day of Resurrection."