Surah Al-Hijr 15:44

لَهَا سَبْعَةُ أَبْوَٰبٍ لِّكُلِّ بَابٍ مِّنْهُمْ جُزْءٌ مَّقْسُومٌ

It has seven gates; for every gate is of them [i.e., Satan's followers] a portion designated."

Translation: Saheeh International

Tafsir

It has seven gates seven layers — to each gate therein belongs an appointed portion lot of them.

Excerpt from Tafsir al-Jalalayn, commentary on 15:44, via Quran.com. The reader has the full commentary and 9 more tafsirs.