Surah Al-Kahf 18:15

هَـٰٓؤُلَآءِ قَوْمُنَا ٱتَّخَذُوا۟ مِن دُونِهِۦٓ ءَالِهَةً ۖ لَّوْلَا يَأْتُونَ عَلَيْهِم بِسُلْطَـٰنٍۭ بَيِّنٍ ۖ فَمَنْ أَظْلَمُ مِمَّنِ ٱفْتَرَىٰ عَلَى ٱللَّهِ كَذِبًا

These, our people, have taken besides Him deities. Why do they not bring for [worship of] them a clear evidence? And who is more unjust than one who invents about Allāh a lie?"

Translation: Saheeh International

Tafsir

These hā’ūlā’ is the subject of the sentence our people qawmunā is an explicative supplement to the subject have taken gods besides Him. Why if what they claim is true do they not bring some clear warrant some manifest argument regarding them? regarding worship of these idols. …

Excerpt from Tafsir al-Jalalayn, commentary on 18:15, via Quran.com. The reader has the full commentary and 9 more tafsirs.