Surah Al-Insan 76:5

إِنَّ ٱلْأَبْرَارَ يَشْرَبُونَ مِن كَأْسٍ كَانَ مِزَاجُهَا كَافُورًا

Indeed, the righteous will drink from a cup [of wine] whose mixture is of Kāfūr,

Translation: Saheeh International

Tafsir

Truly the righteous abrār is the plural of barr or bārr namely the obedient ones will drink from a cup ka’s is a vessel for drinking wine and this wine will be in it; what is meant is that they will drink from ‘wine’ a case where the actuality is referred to by the name of the locus in which it is found; …

Excerpt from Tafsir al-Jalalayn, commentary on 76:5, via Quran.com. The reader has the full commentary and 9 more tafsirs.