Surah Al-Hijr 15:66

وَقَضَيْنَآ إِلَيْهِ ذَٰلِكَ ٱلْأَمْرَ أَنَّ دَابِرَ هَـٰٓؤُلَآءِ مَقْطُوعٌ مُّصْبِحِينَ

And We conveyed to him [the decree] of that matter: that those [sinners] would be eliminated by early morning.

Translation: Saheeh International

Tafsir

And We conveyed We revealed to him the matter which was that these sinners was to be eradicated by morning musbihīn is a circumstantial qualifier in other words their annihilation will take place in the morning.

Excerpt from Tafsir al-Jalalayn, commentary on 15:66, via Quran.com. The reader has the full commentary and 9 more tafsirs.