Surah Al-Kahf Ayahs #99 Translated in English

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.