لَمْ يُحِلُّوا بَنِي رِزَاحٍ بِبَرْقَاءَ نِطَاعٍ لَهُمْ عَلَيْهِمْ دُعَاءُ
Translation: At Barqāʾ Niṭāʿ they did not violate the protected standing of Banū Rizāḥ; instead the episode is recalled through accusation and imprecation.
Banī Rizāḥ names a group, and bi-Barqāʾ Niṭāʿ locates the episode. The commentary understands aḥalla/yuḥillu in relation to violating a protected prohibition or making inviolable matters permissible; duʿāʾ is used in a context of protest or imprecation.
These are historical tribal categories, not ready-made equivalents of modern law. The line belongs to the speaker’s attempt to assign or contest responsibility.