جَاءَ الزَّيْدَانِ أَنْفُسُهُمَا — Both Zayds themselves came.
جَاءَ: singular verb before its overt dual subject.
الزَّيْدَانِ: nominative dual subject, marked with alif.
أَنْفُسُهُمَا: nominative semantic emphasis, marked with ḍammah on the broken-plural form anfus.
humā: dual genitive-attached pronoun (mudāf ilayh).
Do not treat anfus as a dual merely because its pronoun is dual: anfus is a broken plural.
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Tawkīd: Verbal and Semantic Emphasis
جَاءَ الزَّيْدَانِ أَنْفُسُهُمَا — Both Zayds themselves came.
جَاءَ: singular verb before its overt dual subject.
الزَّيْدَانِ: nominative dual subject, marked with alif.
أَنْفُسُهُمَا: nominative semantic emphasis, marked with ḍammah on the broken-plural form anfus.
humā: dual genitive-attached pronoun (mudāf ilayh).
Do not treat anfus as a dual merely because its pronoun is dual: anfus is a broken plural.