Surah Al-Anfal 8:49

إِذْ يَقُولُ ٱلْمُنَـٰفِقُونَ وَٱلَّذِينَ فِى قُلُوبِهِم مَّرَضٌ غَرَّ هَـٰٓؤُلَآءِ دِينُهُمْ ۗ وَمَن يَتَوَكَّلْ عَلَى ٱللَّهِ فَإِنَّ ٱللَّهَ عَزِيزٌ حَكِيمٌ

[Remember] when the hypocrites and those in whose hearts was disease [i.e., arrogance and disbelief] said, "Their religion has deluded those [Muslims]." But whoever relies upon Allāh - then indeed, Allāh is Exalted in Might and Wise.

Translation: Saheeh International

Tafsir

When the hypocrites and those in whose hearts is a sickness a weakness of faith said ‘Their religion has deluded them’ that is the Muslims for they had set out to fight a large army despite their small number in the mistaken belief that they will be victorious because of this. …

Excerpt from Tafsir al-Jalalayn, commentary on 8:49, via Quran.com. The reader has the full commentary and 9 more tafsirs.