جَاءَنِي أَخُوكَ زَيْدٌ
Your brother, Zayd, came to me.
Read as badal kull min kull (whole-for-whole substitution), both expressions denote one person. “Your brother” introduces him; “Zayd” reasserts the intended referent by name.
A superficially similar expression can sometimes be analyzed as explanatory apposition. Grammatical intent and contextual evidence, not the number of visible words alone, help determine the interpretation.
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ʿAṭf al-Bayān, Badal and Coordination: Clarifying, Reinforcing and Specifying the Subject
جَاءَنِي أَخُوكَ زَيْدٌ
Your brother, Zayd, came to me.
Read as badal kull min kull (whole-for-whole substitution), both expressions denote one person. “Your brother” introduces him; “Zayd” reasserts the intended referent by name.
A superficially similar expression can sometimes be analyzed as explanatory apposition. Grammatical intent and contextual evidence, not the number of visible words alone, help determine the interpretation.