Surah Al-Buruj 85:7

وَهُمْ عَلَىٰ مَا يَفْعَلُونَ بِٱلْمُؤْمِنِينَ شُهُودٌ

And they, to what they were doing against the believers, were witnesses.

Translation: Saheeh International

Tafsir

and they themselves to what they did to those who believed in God in the way of torturing them by hurling them into the fire when they did not recant their faith were witnesses they were themselves present thereat. …

Excerpt from Tafsir al-Jalalayn, commentary on 85:7, via Quran.com. The reader has the full commentary and 9 more tafsirs.