so the description of his being a 'mirror' is very precise and profound showing the culmination of brotherhood and solidarity. so your brother, o servant of allaah, is an image of you yourself. sao if he behaves badly it is as if you are the one who has behaved badly, and if he makes a mistake, it is as if you have made a mistake. so he is a mirror for you and then an image of you yourself! so do not treat him except with mildness and gentleness. if you do not behave with your brother in this manner, then this will be something which weakens:

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28.reported by al-bukharee in al-adabul mufrad (no. 239), aboo dawood (eng. trans. 3/1370/no.4900) and others. its chain of narration is hasan.