سورة المؤمنون

Ali ibn Ibrahim: تَلْفَحُ وُجُوهَهُمُ النَّارُ [The Fire will scorch their faces] means the flame of the Fire envelops them and burns them. وَ هُمْ فِیها کالِحُونَ [and therein they will be grim-faced] means with their mouths open and their faces [from the intensity of the heat] a dark red tending to black.

The Messenger of Allah (peace be upon him and his family): وَ هُمْ فِیها کالِحُونَ [and therein they will be grim-faced] means the Fire roasts him such that the upper lip shrinks up to the middle of the head and the lower lip stretches down close to the navel.

Imam al-Hadi (peace be upon him): It is narrated from Imam al-Askari (peace be upon him): Imam al-Hadi (peace be upon him) visited the grave of Imam Ali (peace be upon him) on the Day of Ghadir in this manner and said: "Peace be upon you, O Commander of the Faithful (peace be upon him)! ... Allah has raised your station in this world and will elevate your rank in the hereafter, and He makes you see what is hidden from those who opposed you and placed obstacles between you and what Allah has bestowed upon you. May Allah curse those who deemed your sanctity permissible to violate and who took the right away from you. I bear witness that they are the very losers of whom Allah has said: تَلْفَحُ وُجُوهَهُمُ النَّارُ وَ هُمْ فِیها کالِحُونَ [The Fire will scorch their faces, and therein they will be grim-faced]. And I bear witness that you did not step forward, nor hold back, nor speak, nor keep silent, except by the command of Allah and His Messenger (peace be upon him and his family). (Whatever you did was by the command of Allah and His Messenger.)"