18:21So it was, that We caused them to be discovered, that they would know that the promise of God is true, and that of the Hour there is no doubt. As they were disputing their case among themselves, they said, “Build over them a building.” Their Lord knows best about them. Those who prevailed over their case said, “We will set up over them a place of worship.”

18:94They said, “O Zul-Qarnain, the Gog and Magog are spreading chaos in the land. Can we pay you, to build between us and them a wall?”

18:95He said, “What my Lord has empowered me with is better. But assist me with strength, and I will build between you and them a dam.”