Verse 16

لَهُم مِّن فَوْقِهِمْ ظُلَلٌ مِّنَ ٱلنَّارِ وَمِن تَحْتِهِمْ ظُلَلٌ ذَٰلِكَ يُخَوِّفُ ٱللَّهُ بِهِۦ عِبَادَهُۥ يَـٰعِبَادِ فَٱتَّقُونِ

There will be shades of fire above them and beneath them. God thus instills fear in His servants with this. Therefore, O My servants; be reverent.