فَمَا ٱسْطَـٰعُوٓا۟ أَن يَظْهَرُوهُ وَمَا ٱسْتَطَـٰعُوا۟ لَهُۥ نَقْبًا
Fam a is ta AAoo an ya th haroohu wam a ista ta AAoo lahu naqb a n And thus [the rampart was built, and] their enemies98 were unable to scale it, and neither were they able to pierce it.
 - Mohammad Asad
This became such a barrier that Gog and Magog could not scale it or to dig through it.
 - Muhammad Farooq-i-Azam Malik
And so the enemies could neither scale nor tunnel through it.
 - Mustafa Khattab
And (Gog and Magog) were not able to surmount, nor could they pierce (it).
 - Marmaduke Pickthall
Thus were they made powerless to scale it or to dig through it. 2443
 - Abdullah Yusuf Ali