Surah Al-Kahf, Verse 97

فَمَا ٱسۡطَٰعُوٓاْ أَن يَظۡهَرُوهُ وَمَا ٱسۡتَطَٰعُواْ لَهُۥ نَقۡبٗا٩٧

famā is'ṭāʿū an yaẓharūhu wamā is'taṭāʿū lahu naqban

So they [i.e., Gog and Magog] were unable to pass over it, nor were they able [to effect] in it any penetration.