You are asking about Dhul-Qarnayn and about Ya'juj and Ma'juj?

Question:
May Allah reward you with good and do you well. Finally, Shaykh Salih asks about Dhul-Qarnayn and about Mu'ajjiz and Mu'ajjiz? Yes.

Answer:
As for Dhul-Qarnayn, he was a righteous king whom Allah granted sovereignty over the earth and empowered with strength. He traveled across the earth and carried out reforms, among which was building a barrier between the people of the earth and Ya'juj and Ma'juj. They are a nation of people, a creation of Allah from the descendants of Adam, characterized by aggression, harm, and tyranny. So he built this barrier. For this reason, the people of that region said to him: . They are corrupters, and they complained of their corruption, so he built this barrier.
A barrier between them and the people of the earth, which Allah made a mercy for the servants. When the time of the Hereafter and the standing of the Hour comes, they will emerge from this barrier and spread corruption in the earth. When , when the promise of my Lord comes , this is the wisdom of Allah (Glorified and Exalted is He).