Surah Al-Muzzammil 73:12
إِنَّ لَدَيْنَآ أَنكَالًا وَجَحِيمًا
Indeed, with Us [for them] are shackles and burning fire.
Translation: Saheeh International
Tafsir
For indeed with Us are heavy fetters ankāl is the plural of nikl heavy shackles and a hell-fire a scorching Fire
Excerpt from Tafsir al-Jalalayn, commentary on 73:12, via Quran.com. The reader has the full commentary and 9 more tafsirs.