They said, "O Dhul-Qarnayn, indeed Gog and Magog1 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."
[Dhul-Qarnayn] said, "This is a mercy from my Lord; but when the promise of my Lord1 comes [i.e., approaches], He will make it level, and ever is the promise of my Lord true."