Surah Al-Hijr 15:78

وَإِن كَانَ أَصْحَـٰبُ ٱلْأَيْكَةِ لَظَـٰلِمِينَ

And the companions of the thicket [i.e., the people of Madyan] were [also] wrongdoers,

Translation: Saheeh International

Tafsir

And certainly in has been softened in other words understand it as being innahu the dwellers in the wood a huddle of trees near Midian — these were the people of the prophet Shu‘ayb — were evildoers for denying Shu‘ayb.

Excerpt from Tafsir al-Jalalayn, commentary on 15:78, via Quran.com. The reader has the full commentary and 9 more tafsirs.