18:97

Al-Kahf 18:97

فَمَا ٱسْطَٰعُوٓا۟ أَن يَظْهَرُوهُ وَمَا ٱسْتَطَٰعُوا۟ لَهُۥ نَقْبًۭا

Famas taa'ooo any yazharoohu wa mastataa'oo lahoo naqbaa

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