مَرَرْتُ بِغُلَامَيْ زَيْدٍ.
I passed by Zayd’s two servants.
Bi governs genitive, while iḍāfah—not the preposition—accounts for loss of the dual nūn.
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Genitive Dual in Iḍāfah
The Dual Noun: Inflection, Maqṣūr, Mamdūd and Iḍāfah
مَرَرْتُ بِغُلَامَيْ زَيْدٍ.
I passed by Zayd’s two servants.
Bi governs genitive, while iḍāfah—not the preposition—accounts for loss of the dual nūn.