Abu Hurairah (RAA) narrated that the Messenger of Allah (ﷺ) said:
"Every believer is the mirror of his brother." Related by Abu Dawud with a good chain of narrators. (JA)
English reference (JA): Book 16, Hadith 1578 (JA)
Arabic reference (JA): Book 16, Hadith 1535 (JA)