This is the 5002nd most frequent Arabic word.
المؤمنين
"المؤمنين" translates to "the believers" in English.
In this sentence, 'المؤمنين' refers to a group of believers, used as the subject performing the action of praying in the mosque.
المؤمنين يصلون في المسجد.
The believers pray in the mosque.
Here, 'المؤمنين' is the object of the verb 'رأيت', indicating the group of believers observed at the event.
رأيت المؤمنين في الحفل الخيري.
I saw the believers at the charity event.
In this sentence, 'المؤمنين' is used as the object of the preposition 'لـ', signifying the group to whom the prayer is directed.