Az-Zumar 39:16

Lahum min fawqihim thulalunmina annari wamin tahtihim thulalunthalika yukhawwifu Allahu bihi AAibadahu yaAAibadi fattaqoon

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.

For them there are canopies of fire on top of them and canopies (of fire) underneath them. That is the thing against which Allah warns His servants. “So, O servants of Mine, fear Me.”