Qur'an 18:97 · Al-Kahf

فَمَا ٱسْطَٰعُوٓا۟ أَن يَظْهَرُوهُ وَمَا ٱسْتَطَٰعُوا۟ لَهُۥ نَقْبًۭا

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