وَيَعْمَلُ عَمَلَ فِعْلِهِ الْمَجْهُولِ.
The passive participle governs like the corresponding passive verb: it raises a nāʾib fāʿil (passive subject), not an ordinary active subject.
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What Does It Govern?
Ism al-Mafʿūl: Formation, Weak Roots and Government
وَيَعْمَلُ عَمَلَ فِعْلِهِ الْمَجْهُولِ.
The passive participle governs like the corresponding passive verb: it raises a nāʾib fāʿil (passive subject), not an ordinary active subject.