﴿ لَهَا سَبْعَةُ أَبْوَٰبٍۢ لِّكُلِّ بَابٍۢ مِّنْهُمْ جُزْءٌۭ مَّقْسُومٌ ﴾

“with seven gates leading into it, each gate receiving its allotted share of sinners. -”

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