مُسْلِمَيْنِ — مُسْلِمِينَ
Muslimayni is dual, with fatḥah before yāʾ and kasrah on nūn.
Muslimīna is sound masculine plural, with kasrah before yāʾ and fatḥah on nūn.
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Dual versus Sound Masculine Plural
The Dual Noun: Inflection, Maqṣūr, Mamdūd and Iḍāfah
مُسْلِمَيْنِ — مُسْلِمِينَ
Muslimayni is dual, with fatḥah before yāʾ and kasrah on nūn.
Muslimīna is sound masculine plural, with kasrah before yāʾ and fatḥah on nūn.