AL KAHFI (GUA) — Ayat 97

فَمَا اسْطَاعُوا أَن يَظْهَرُوهُ وَمَا اسْتَطَاعُوا لَهُ نَقْبًا

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