Surah At-Tawbah 9:26

ثُمَّ أَنزَلَ ٱللَّهُ سَكِينَتَهُۥ عَلَىٰ رَسُولِهِۦ وَعَلَى ٱلْمُؤْمِنِينَ وَأَنزَلَ جُنُودًا لَّمْ تَرَوْهَا وَعَذَّبَ ٱلَّذِينَ كَفَرُوا۟ ۚ وَذَٰلِكَ جَزَآءُ ٱلْكَـٰفِرِينَ

Then Allāh sent down His tranquility upon His Messenger and upon the believers and sent down soldiers [i.e., angels] whom you did not see and punished those who disbelieved. And that is the recompense of the disbelievers.

Translation: Saheeh International

Tafsir

Then God sent down His Spirit of Peace His reassurance upon His Messenger and upon the believers and so they turned back towards the Prophet s after al-‘Abbās called them with his the Prophet’s permission and they fought once again; …

Excerpt from Tafsir al-Jalalayn, commentary on 9:26, via Quran.com. The reader has the full commentary and 9 more tafsirs.