In ḥāfiẓa al-Qurʾāni the next noun is a genitive second member of iḍāfa. In ḥāfiẓan darsahu it is an accusative object of the participle.
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Construct versus Quasi-Construct
Vocative Particles: Five Forms, Uses and Parsing
In ḥāfiẓa al-Qurʾāni the next noun is a genitive second member of iḍāfa. In ḥāfiẓan darsahu it is an accusative object of the participle.