Surah As-Saffat 37:1
وَٱلصَّـٰٓفَّـٰتِ صَفًّا
By those [angels] lined up in rows
Translation: Saheeh International
Tafsir
By those who are ranged in ranks — by the angels who range their souls in worship or their wings in the air awaiting their orders;
Excerpt from Tafsir al-Jalalayn, commentary on 37:1, via Quran.com. The reader has the full commentary and 9 more tafsirs.