So Gog and Magog were unable to pass over it, nor were they able [to effect] in it any penetration.
The Saheeh International Quran Translation
فَمَا ٱسْطَٰعُوٓا۟ أَن يَظْهَرُوهُ وَمَا ٱسْتَطَٰعُوا۟ لَهُۥ نَقْبًاSo Gog and Magog were unable to pass over it, nor were they able [to effect] in it any penetration.