Dhu’l-Qarnayn was the first person to construct a wall.

Dhu’l-Qarnayn was the first person to construct a wall. Then he spread firewood on the ingots and ignited fire and left it for some time. Then he began to blow at it and when the iron melted, Dhu’l-Qarnayn called for molten brass. The people brought copper from the mountains and spread it on iron. The copper melted and mixed with iron and the wall was ready. Neither Yajooj (Gog) nor Majooj (Magog) could scale it. They could not even make a hole in this wall.

Dhu’l-Qarnayn was a righteous servant of Allah who commanded a high position and status. He loved the Almighty and worshipped Him with sincerity. The…