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?"
Translation: Saheeh International (English)
1 Savage tribes who had ravaged large parts of central Asia, committing every kind of atrocity.
They said: “O Dhu’l-Qarnayn, Gog and Magog (meaning two great nations from the children of Adam) are causing corruption on earth by killing and so forth, so can we give you some wealth so you can make a barrier between us and them?”