مَرَرْتُ بِمُسْلِمِيَّ
Translation: I passed by my Muslims.
مَرَرْتُ: past verb built on sukūn; تُ: attached subject pronoun.
بِـ: preposition built on kasra, without its own case position. مُسْلِمِيَّ: genitive noun governed by bāʾ with yāʾ as its sign. It is also muḍāf with the first-person pronoun as muḍāf ilayh. The prepositional phrase is linked to «مَرَرْتُ».