Surah Al-Anbya 21:96

حَتَّىٰٓ إِذَا فُتِحَتْ يَأْجُوجُ وَمَأْجُوجُ وَهُم مِّن كُلِّ حَدَبٍ يَنسِلُونَ

Until when [the dam of] Gog and Magog has been opened and they, from every elevation, descend

Translation: Saheeh International

Tafsir

Until hattā a particle expressing the end of the prohibition of their return when Gog and Magog read Ya’jūju wa-Ma’jūju or Yājūju wa-Mājūju these are non-Arabic names of two tribes; …

Excerpt from Tafsir al-Jalalayn, commentary on 21:96, via Quran.com. The reader has the full commentary and 9 more tafsirs.