Surah Al-Anfal 8:44

وَإِذْ يُرِيكُمُوهُمْ إِذِ ٱلْتَقَيْتُمْ فِىٓ أَعْيُنِكُمْ قَلِيلًا وَيُقَلِّلُكُمْ فِىٓ أَعْيُنِهِمْ لِيَقْضِىَ ٱللَّهُ أَمْرًا كَانَ مَفْعُولًا ۗ وَإِلَى ٱللَّهِ تُرْجَعُ ٱلْأُمُورُ

And [remember] when He showed them to you, when you met, as few in your eyes, and He made you [appear] as few in their eyes so that Allāh might accomplish a matter already destined. And to Allāh are [all] matters returned.

Translation: Saheeh International

Tafsir

And when God made you see them O believers when you met — in your eyes as few as 70 or 100 when they were in fact 1000 so that you would advance against them; and He made you seem as few in their eyes so that they would advance and not turn back from fighting you — this was before close combat had begun but when it …

Excerpt from Tafsir al-Jalalayn, commentary on 8:44, via Quran.com. The reader has the full commentary and 9 more tafsirs.