فَمَا ٱسْطَـٰعُوٓا۟ أَن يَظْهَرُوهُ وَمَا ٱسْتَطَـٰعُوا۟ لَهُۥ نَقْبًا

Al-Kahf — Ayah 97

The Cave · الكهف · 18:97

So they (Ya’jūj and Ma’jūj) were not able to climb it, nor were they able to make a hole in it.

Translation: Mufti Taqi Usmani