(18:91) Thus. And We had encompassed [all] that he had in knowledge. (18:92) Then he followed a way (18:93) Until, when he reached [a pass] between two mountains, he found beside them a people who could hardly understand [his] speech. (18:94) 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?" (18:95) He said, "That in which my Lord has established me is better [than what you offer], but assist me with strength; I will make between you and them a dam. (18:96) Bring me sheets 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." (18:97) So Gog and Magog were unable to pass over it, nor were they able [to effect] in it any penetration.