Surah Ghafir 40:51

إِنَّا لَنَنصُرُ رُسُلَنَا وَٱلَّذِينَ ءَامَنُوا۟ فِى ٱلْحَيَوٰةِ ٱلدُّنْيَا وَيَوْمَ يَقُومُ ٱلْأَشْهَـٰدُ

Indeed, We will support Our messengers and those who believe during the life of this world and on the Day when the witnesses will stand -

Translation: Saheeh International

Tafsir

Truly We shall help Our messengers and those who believe in the life of this world and on the day when the witnesses rise up ashhād is the plural of shāhid — these are the angels who will testify in support of the messengers that they indeed delivered their Messages and against the disbelievers that they denied them;

Excerpt from Tafsir al-Jalalayn, commentary on 40:51, via Quran.com. The reader has the full commentary and 9 more tafsirs.