Surah An-Naba — Ayah 38 (78:38)
يَوۡمَ يَقُومُ ٱلرُّوحُ وَٱلۡمَلَٰٓئِكَةُ صَفّٗاۖ لَّا يَتَكَلَّمُونَ إِلَّا مَنۡ أَذِنَ لَهُ ٱلرَّحۡمَٰنُ وَقَالَ صَوَابٗا ٣٨
English translation (Saheeh International)
The Day that the Spirit [i.e., Gabriel] and the angels will stand in rows, they will not speak except for one whom the Most Merciful permits, and he will say what is correct.
Brief commentary
On the day when Gabriel and the angels will stand in rows, not speaking to intercede on behalf of anyone except whom the Benevolent grants them permission to intercede for, and has made a straight statement i.e. the statement of oneness of Allah.