وَرِثْنَاهُنَّ عَنْ آبَاءَ صِدْقٍ
We inherited them from honourable forefathers.
وَنُورِثُهَا إِذَا مُتْنَا بَنِينَا
We shall pass them to our sons after our deaths.
Past and imperfect verbs establish a temporal contrast. Ancestors, the present speakers, and their future descendants appear in one thought. The inherited animal becomes a sign of continuous tribal identity.