Surah An-Naba 78:25

إِلَّا حَمِيمًا وَغَسَّاقًا

Except scalding water and [foul] purulence -

Translation: Saheeh International

Tafsir

except boiling water of extreme temperatures and pus read ghasāqan or ghassāqan which is the vile matter that is emitted by the bodies of the inhabitants of the Fire which is what they will indeed taste. They are given this pair of tortures

Excerpt from Tafsir al-Jalalayn, commentary on 78:25, via Quran.com. The reader has the full commentary and 9 more tafsirs.