Al-Kahf

Thus. And We had encompassed [all] that he had in knowledge.

Then he followed a way.

Until, when he reached [a pass] between two mountains, he found beside them a people who could hardly understand [his] speech.

They said, "O Dhul-Qarnayn, indeed Gog and Magog are [great] corrupters in the land. So may we assign for you an expenditure that you might make between us and them a barrier?"

He said, "That in which my Lord has established me is better [than what you offer], but assist me with strength [i.e., manpower]; I will make between you and them a dam.

Bring me bars of iron" - until, when he had leveled [them] between the two mountain walls, he said, "Blow [with bellows]," until when he had made it [like] fire, he said, "Bring me, that I may pour over it molten copper."

So they [i.e., Gog and Magog] were unable to pass over it, nor were they able [to effect] in it any penetration.

[Dhul-Qarnayn] said, "This is a mercy from my Lord; but when the promise of my Lord comes [i.e., approaches], He will make it level, and ever is the promise of my Lord true."

And We will leave them that day surging over each other, and [then] the Horn will be blown, and We will assemble them in [one] assembly.

And We will present Hell that Day to the disbelievers, on display -