Surah Ali 'Imran 3:122

إِذْ هَمَّت طَّآئِفَتَانِ مِنكُمْ أَن تَفْشَلَا وَٱللَّهُ وَلِيُّهُمَا ۗ وَعَلَى ٱللَّهِ فَلْيَتَوَكَّلِ ٱلْمُؤْمِنُونَ

When two parties among you were about to lose courage, but Allāh was their ally; and upon Allāh the believers should rely.

Translation: Saheeh International

Tafsir

When idh substitutes for the previous idh two parties of you the Banū Salima and the Banū Hāritha the two flanks of the army were about to lose heart about to shrink from the battle and retreat after ‘Abd Allāh b. Ubayy the hypocrite and his companions began to retreat. …

Excerpt from Tafsir al-Jalalayn, commentary on 3:122, via Quran.com. The reader has the full commentary and 9 more tafsirs.