فما اسطاعوا أن يظهروه وما استطاعوا له نقبا (18:97) بالانجليزي

﴿فَمَا اسْطَاعُوا أَن يَظْهَرُوهُ وَمَا اسْتَطَاعُوا لَهُ نَقْبًا﴾
[ الكهف: 97]

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

عبد الله يوسف علي

Thus were they made powerless to scale it or to dig through it.

تقي الدين الهلالي

So they [Ya'juj and Ma'juj (Gog and Magog)] were made powerless to scale it or dig through it.

صفي الرحمن المباركفوري

So they could not scale it or dig through it.