The Messenger of Allah ﷺ said, "The believer is the mirror of the believer."
قال رسول الله ﷺ: المؤمن مرآة المؤمن.
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Bazzar (6193), Tabarani in al-Awsat (2114) - and from his route Diya in al-Mukhtarah (2185) -, Abu Shaykh in al-Amthal (43), and Ibn Adi in al-Kamil (7/467) all narrated it through various chains from Muhammad bin Ammar bin Saad the muezzin of Madinah, from Sharik bin Abdullah bin Abu Nimr, from Anas bin Malik, and he related it.Bazzar said, "We do not know of anyone narrating this hadith from Sharik except Muhammad bin Ammar, and we do not know of it being narrated from Anas except through this route."I say, this isnad is hasan due to Muhammad bin Ammar bin Saad the muezzin and Sharik bin Abdullah bin Abu Nimr, for both of them are hasan in their hadith. As for Dhahabi's statement in al-Mizan (3/662) that it is among the munkar narrations of Muhammad bin Ammar, what he meant by this is his being the sole narrator, as Bazzar said.