Surah Al-Hijr 15:30

فَسَجَدَ ٱلْمَلَـٰٓئِكَةُ كُلُّهُمْ أَجْمَعُونَ

So the angels prostrated - all of them entirely,

Translation: Saheeh International

Tafsir

And so the angels prostrated all of them together kulluhum ajma‘ūn contains two elements of emphasis

Excerpt from Tafsir al-Jalalayn, commentary on 15:30, via Quran.com. The reader has the full commentary and 9 more tafsirs.