Surah Sad 38:73
فَسَجَدَ ٱلْمَلَـٰٓئِكَةُ كُلُّهُمْ أَجْمَعُونَ
So the angels prostrated - all of them entirely,
Translation: Saheeh International
Tafsir
Thereat the angels prostrated all of them together there are two emphases here kulluhum and ajma‘ūn;
Excerpt from Tafsir al-Jalalayn, commentary on 38:73, via Quran.com. The reader has the full commentary and 9 more tafsirs.