جَاءَنِي مُسْلِمُونَ وَعِشْرُونَ رَجُلًا وَأُولُو مَالٍ.
Translation: Some Muslims, twenty men, and people of means came to me.
First segment: «جَاءَنِي مُسْلِمُونَ»
جَاءَ: past-tense verb, built on fatḥa, “came.”
نِ: nūn of protection, a particle with no syntactic case position.
ي: first-person attached pronoun, in the accusative position as the object, “to me.”
مُسْلِمُونَ: subject (fāʿil), nominative with wāw as a sound masculine plural.
Key point: “-nī” is not the subject; «مُسْلِمُونَ» is the subject.