﴿فَمَا اسْطَاعُوا أَنْ يَظْهَرُوهُ وَمَا اسْتَطَاعُوا لَهُ نَقْبًا﴾ 97. So they [Ya’jûj and Ma’jûj (Gog and Magog)] could not scale it or dig through it.
