“They said: “O Dhu’l-Qarneyn! the Gog and Magog do great mischief on earth: shall we then render thee tribute in order that thou might erect a barrier between us and them?”

He said: “(The power) in which my Lord has established me is better (than tribute): help me therefore with strength (and labour): I will erect a strong barrier between you and them:

“Bring me blocks of iron.” At length, when he had filled up the space between the two steep mountain sides, he said, “Blow (with your bellows)” then, when he had made it (red) as fire, he said: “Bring me, that I may pour over it, molten lead.”

Thus were they made powerless to scale it or to dig through it.

He said: “This is a mercy from my Lord: but when the promise of my Lord comes to pass, He will make it into dust; and the promise of my Lord is true.”

On that day We shall leave them to surge like waves on one another: the trumpet will be blown, and We shall collect them all together.

And We shall present Hell that day for Unbelievers to see, all spread out[…]”

– Quran 18:94-101