Hawzah News Agency – The merciful prophet of Islam, peace be upon him and his household says:

يَجي‏ءُ يَومَ القِيامَةِ ذو الوَجهَينِ دالِعاً لِسانَهُ في قَفاهُ، وآخَرُ مِن قُدّامِهِ، يَلتَهِبانِ ناراً حتّى‏ يُلهِبا جَسَدَهُ، ثُمّ يُقالُ لَهُ: هذا الّذي كانَ في الدُّنيا ذا وَجهَينِ وذا لِسانَينِ، يُعرَفُ بذلكَ يَومَ القِيامَةِ.

'He [the hypocrite] will come on the Day of Judgment with two faces and with his tongue hanging out from the back of his head, and with another tongue hanging in front. They will both be ignited with fire until they ignite his body, then it will be said about him: This is the one who was two-faced and two-tongued in the world, and he will be known as such on the Day of Resurrection.'

Source: al-Khisal, p. 38, no. 16