Surah Al-Mu'minun 23:104

تَلْفَحُ وُجُوهَهُمُ ٱلنَّارُ وَهُمْ فِيهَا كَـٰلِحُونَ

The Fire will sear their faces, and they therein will have taut smiles.

Translation: Saheeh International

Tafsir

The Fire will scorch their faces it will burn them while they glower therein their upper and lower lips having receded from their teeth and it will be said to them

Excerpt from Tafsir al-Jalalayn, commentary on 23:104, via Quran.com. The reader has the full commentary and 9 more tafsirs.