Hādhā al-kitābu alladhī qaraʾtuhu: the relative pronoun refers to the book; the object suffix -hu inside the relative clause links it back to its antecedent.
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The Returning Pronoun in a Relative Clause
Choosing the Correct Parsing: Meaning, Governance and Context
Hādhā al-kitābu alladhī qaraʾtuhu: the relative pronoun refers to the book; the object suffix -hu inside the relative clause links it back to its antecedent.