جَاءَ الزَّيْدَانِ نَفْسَاهُمَا — Both Zayds themselves came.
الزَّيْدَانِ: nominative dual subject.
نَفْسَاهُمَا: nominative dual emphasis (alif); the dual nūn falls because the noun is in iḍāfah.
humā: attached pronoun as mudāf ilayh, referring to the two.
Unlike the broken-plural anfus, the word nafsā is itself a dual.
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Tawkīd: Verbal and Semantic Emphasis
جَاءَ الزَّيْدَانِ نَفْسَاهُمَا — Both Zayds themselves came.
الزَّيْدَانِ: nominative dual subject.
نَفْسَاهُمَا: nominative dual emphasis (alif); the dual nūn falls because the noun is in iḍāfah.
humā: attached pronoun as mudāf ilayh, referring to the two.
Unlike the broken-plural anfus, the word nafsā is itself a dual.