Surah Al-Muddaththir 74:34
وَٱلصُّبْحِ إِذَآ أَسْفَرَ
And [by] the morning when it brightens,
Translation: Saheeh International
Tafsir
And by the dawn when it appears!
Excerpt from Tafsir al-Jalalayn, commentary on 74:34, via Quran.com. The reader has the full commentary and 9 more tafsirs.