جَاءَ زَيْدٌ كَاتِبًا رِسَالَةً.
Kātiban is a ḥāl describing Zayd while coming. It governs risālatan as object, and its implicit subject refers to Zayd.
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A Clear Ḥāl Construction
Ism al-Fāʿil: Formation, Governance, Conditions and Time
جَاءَ زَيْدٌ كَاتِبًا رِسَالَةً.
Kātiban is a ḥāl describing Zayd while coming. It governs risālatan as object, and its implicit subject refers to Zayd.