The Prophet ﷺ said: The believer is the believer's mirror, and the believer is the believer's brother who guards him against loss and protects him when he is absent.  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ الْمُؤْمِنُ مِرْآةُ الْمُؤْمِنِ وَالْمُؤْمِنُ أَخُو الْمُؤْمِنِ يَكُفُّ عَلَيْهِ ضَيْعَتَهُ وَيَحُوطُهُ مِنْ وَرَائِهِ