Sura al-Kahf 18:94

قَالُوا۟ يَٰذَا ٱلْقَرْنَيْنِ إِنَّ يَأْجُوجَ وَمَأْجُوجَ مُفْسِدُونَ فِى ٱلْأَرْضِ فَهَلْ نَجْعَلُ لَكَ خَرْجًا عَلَىٰٓ أَن تَجْعَلَ بَيْنَنَا وَبَيْنَهُمْ سَدًّا

qālū yādhā l-qarnayni inna yaʾjūja wa-maʾjūja mufsidūna fī l-arḍi fa-hal najʿalu la-ka kharjan ʿala an tajʿala baynanā wa-baynahum saddan

They said: "O Zul-qarnain! the Gog and Magog (People) do great mischief on earth: shall we then render thee tribute in order that thou mightest erect a barrier between us and them?

Sura al-Anbiyāʾ 21:96

حَتَّىٰٓ إِذَا فُتِحَتْ يَأْجُوجُ وَمَأْجُوجُ وَهُم مِّن كُلِّ حَدَبٍ يَنسِلُونَ

ḥatta idhā futiḥat yaʾjūju wa-maʾjūju wa-hum min kulli ḥadabin yansilūna

Until the Gog and Magog (people) are let through (their barrier), and they swiftly swarm from every hill.