Al-Kahf 18:94

Qaloo ya tha alqarnayniinna ya/jooja wama/jooja mufsidoona fee al-ardi fahalnajAAalu laka kharjan AAala an tajAAala baynanawabaynahum sadda

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?"

They said, “O Dhul-Qarnain, the (tribes of) Ya’jūj and Ma’jūj (Gog and Magog) are mischief-makers on the earth. So, should we assign a tax for you on condition that you make a barrier between us and them?”