Surah Al-Fajr 89:9

وَثَمُودَ ٱلَّذِينَ جَابُوا۟ ٱلصَّخْرَ بِٱلْوَادِ

And [with] Thamūd, who carved out the rocks in the valley?

Translation: Saheeh International

Tafsir

and Thamūd who hollowed hewed the rocks sakhr is the plural of sakhra in the valley the Wādī al-Qurā rocks which they used as dwellings

Excerpt from Tafsir al-Jalalayn, commentary on 89:9, via Quran.com. The reader has the full commentary and 9 more tafsirs.