لَيَسْتَلِبُنَّ أَفْرَاسًا وَبِيضًا وَأَسْرَى فِي الْحَدِيدِ مُقَرَّنِينَا
They must seize horses and helmets from the enemy and bring back captives bound together in iron.
La-yastalibunna carries emphatic force and refers to taking spoils. Afrāsan means horses and bīḍan helmets here, not simply white objects.
Muqarranīnā describes captives bound together. This verse completes the pledge introduced immediately before and must be interpreted within the harsh conditions of pre-Islamic tribal war.