Surah Al-Mutaffifin 83:8
وَمَآ أَدْرَىٰكَ مَا سِجِّينٌ
And what can make you know what is sijjeen?
Translation: Saheeh International
Tafsir
And what would tell you what Sijjīn is? what the book of Sijjīn is.
Excerpt from Tafsir al-Jalalayn, commentary on 83:8, via Quran.com. The reader has the full commentary and 9 more tafsirs.