Al-Kahf 97
فَمَا ٱسْطَٰعُوٓا۟ أَن يَظْهَرُوهُ وَمَا ٱسْتَطَٰعُوا۟ لَهُۥ نَقْبًا ﴿٩٧﴾
Fama istaAAoo an yathharoohu wama istataAAoo lahu naqban
So they [Ya'juj and Ma'juj (Gog and Magog)] were made powerless to scale it or dig through it. The Noble Quran