«عُمَرَ» is a genitive muḍāf ilayh. Since «عُمَر» is diptote, its genitive ending is fatḥah rather than kasrah in this construction.
مَرَرْتُ بِعُمَرَ.
Translation: I passed by ʿUmar.
A visible fatḥah does not automatically mean accusative: determine the case from the syntactic role and governing relation.
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ʿAṭf al-Bayān: Definition, Examples, and Contrast with Badal
«عُمَرَ» is a genitive muḍāf ilayh. Since «عُمَر» is diptote, its genitive ending is fatḥah rather than kasrah in this construction.
مَرَرْتُ بِعُمَرَ.
Translation: I passed by ʿUmar.
A visible fatḥah does not automatically mean accusative: determine the case from the syntactic role and governing relation.