An ordinary sound masculine plural is مُسْلِمُونَ in the nominative and مُسْلِمِينَ in the accusative/genitive.
In an iḍāfa, its final plural nūn is dropped: e.g. مُسْلِمُو الْبَلَدِ and مُسْلِمِي الْبَلَدِ.
The present textbook rule concerns the special case of addition to the first-person yāʾ, where an additional sound change occurs.
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Noun Case Class 9 — Sound Masculine Plural with My
An ordinary sound masculine plural is مُسْلِمُونَ in the nominative and مُسْلِمِينَ in the accusative/genitive.
In an iḍāfa, its final plural nūn is dropped: e.g. مُسْلِمُو الْبَلَدِ and مُسْلِمِي الْبَلَدِ.
The present textbook rule concerns the special case of addition to the first-person yāʾ, where an additional sound change occurs.