There are two 1st-person plural pronouns in Arabic, one colloquial (ihna) and one formal (nahnu), and they both mean essentially the same thing.
Muslim preachers (khatibs/imams/etc.) usually don't refer to all Muslims using "we," they usually refer to them as "Al-Muslimun", which is plural for "the Muslims".
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There are two 1st-person plural pronouns in Arabic, one colloquial (ihna) and one formal (nahnu), and they both mean essentially the same thing. Muslim preachers (khatibs/imams/etc.) usually don't refer to all Muslims using "we," they usually refer to them as "Al-Muslimun", which is plural for "the Muslims".