Surah Al-Ahzab 33:26

وَأَنزَلَ ٱلَّذِينَ ظَـٰهَرُوهُم مِّنْ أَهْلِ ٱلْكِتَـٰبِ مِن صَيَاصِيهِمْ وَقَذَفَ فِى قُلُوبِهِمُ ٱلرُّعْبَ فَرِيقًا تَقْتُلُونَ وَتَأْسِرُونَ فَرِيقًا

And He brought down those who supported them among the People of the Scripture from their fortresses and cast terror into their hearts [so that] a party [i.e., their men] you killed, and you took captive a party [i.e., the women and children].

Translation: Saheeh International

Tafsir

And He brought down those of the People of the Scripture namely the Banū Qurayza who had supported them from their strongholds sayāsī is the plural of sīsa and is that in which one fortifies himself against an enemy and He cast terror into their hearts so that some of them you slew and these were the combatants and …

Excerpt from Tafsir al-Jalalayn, commentary on 33:26, via Quran.com. The reader has the full commentary and 9 more tafsirs.