الانبياۤء — Al-Anbiya' Ayat 96
حَتّٰىٓ اِذَا فُتِحَتْ يَأْجُوْجُ وَمَأْجُوْجُ وَهُمْ مِّنْ كُلِّ حَدَبٍ يَّنْسِلُوْنَ
Ḥattā iżā futiḥat ya'jūju wa ma'jūju wa hum min kulli ḥadabiy yansilūn(a).
"Until when [the dam of] Gog and Magog has been opened and they, from every elevation, descend"