Surah Al-Kahf 18:85
فَأَتْبَعَ سَبَبًا
So he followed a way
Translation: Saheeh International
Tafsir
And he followed a way he took a route towards the west
Excerpt from Tafsir al-Jalalayn, commentary on 18:85, via Quran.com. The reader has the full commentary and 9 more tafsirs.