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. (Using translation from Abū Dāʾūd 4918)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ الْمُؤْمِنُ مَرْآةُ الْمُؤْمِنِ وَالْمُؤْمِنُ أَخُو الْمُؤْمِنِ مِنْ حَيْثُ لَقِيَهُ يَكُفُّ عَنْهُ ضَيْعَتَهُ وَيَحُوطُهُ مِنْ وَرَائِهِ