Musnad Abu Ya'la al-Mawsili 105:19

Abu Bakr ibn Abi Shaybah narrated to us, Sharik narrated to us, from al-Rukin ibn al-Rabi’, from Nu’aym ibn Hanzalah, from ‘Ammar, from the Prophet (peace and blessings of Allah be upon him), who said: "Whoever is two-faced in this world will have two tongues of fire on the Day of Resurrection."