مَرَرْتُ بِمُسْلِمَاتٍ.
Translation: I passed by Muslim women.
Grammatical analysis
مَرَرْتُ: past-tense verb with first-person subject pronoun.
بِـ: preposition.
مُسْلِمَاتٍ: a genitive noun with kasra as its sign.
This time مُسْلِمَاتٍ really is genitive, because the preposition governs it.
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Noun Case Classes: Type 2 — Sound Feminine Plural
مَرَرْتُ بِمُسْلِمَاتٍ.
Translation: I passed by Muslim women.
Grammatical analysis
مَرَرْتُ: past-tense verb with first-person subject pronoun.
بِـ: preposition.
مُسْلِمَاتٍ: a genitive noun with kasra as its sign.
This time مُسْلِمَاتٍ really is genitive, because the preposition governs it.