Surah Az-Zumar 39:16

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

They will have canopies [i.e., layers] of fire above them and below them, canopies. By that Allāh threatens [i.e., warns] His servants. O My servants, then fear Me.

Translation: Saheeh International

Tafsir

Above them they will have canopies layers of fire and beneath them they will have similar canopies of fire. That is what God frightens His servants with that is the believing ones that they may have fear of Him — this sense of the verse is suggested by what follows “So O servants of Mine fear Me!”’

Excerpt from Tafsir al-Jalalayn, commentary on 39:16, via Quran.com. The reader has the full commentary and 9 more tafsirs.