Surah Al-Qalam 68:19

فَطَافَ عَلَيْهَا طَآئِفٌ مِّن رَّبِّكَ وَهُمْ نَآئِمُونَ

So there came upon it [i.e., the garden] an affliction from your Lord while they were asleep.

Translation: Saheeh International

Tafsir

Then a visitation from your Lord visited it that is a fire consumed it during the night while they slept.

Excerpt from Tafsir al-Jalalayn, commentary on 68:19, via Quran.com. The reader has the full commentary and 9 more tafsirs.