Surah Al-Falaq 113:3
وَمِن شَرِّ غَاسِقٍ إِذَا وَقَبَ
And from the evil of darkness when it settles
Translation: Saheeh International
Tafsir
and from the evil of darkness when it gathers that is from night when it becomes dark and the moon when it is absent
Excerpt from Tafsir al-Jalalayn, commentary on 113:3, via Quran.com. The reader has the full commentary and 9 more tafsirs.