Bulugh al-Maram, Book 16, Hadith 1535 (In-Book) ⓘ
Abu Hurairah (RAA) narrated that the Messenger of Allah said: “Every believer is the mirror of his brother.” Related by Abu Dawud with a good chain of narrators.
وَعَنْهُ قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ اَلْمُؤْمِنُ مِرْآةُ اَلْمُؤْمِنِ } أَخْرَجَهُ أَبُو دَاوُدَ بِإِسْنَادٍ حَسَنٍ. (1997). 3 -. حسن. رواه أبو داود (4918) وزاد:" والمؤمن أخو المؤمن: يكف عليه ضيعته، ويحوطه من ورائه".
also referenced under: Book 16, Hadith 1578 (English)