A Muslim does not cause harm to another Muslim

The Messenger of Allah ﷺ said: “A Muslim is the brother of a Muslim: he does not betray him, nor lie to him, nor betray him. Everything of a Muslim is inviolable to another Muslim: his honor, his wealth, and his blood. Piety is here (in the chest). It is enough evil for a person to despise his Muslim brother.”

قَالَ رَسُولُ اللَّهِ ﷺ: «الْمُسْلِمُ أَخُو الْمُسْلِمِ: لاَ يَخُونُهُ وَلاَ يَكْذِبُهُ وَلاَ يَخْذُلُهُ. كُلُّ الْمُسْلِمِ عَلَى الْمُسْلِمِ حَرَامٌ عِرْضُهُ وَمَالُهُ وَدَمُهُ. التَّقْوَى هَا هُنَا بِحَسْبِ امْرِئٍ مِنَ الشَّرِّ أَنْ يَحْتَقِرَ أَخَاهُ الْمُسْلِمَ».

: The believer is to the believer like parts of a building, each one of them supporting the other."

قَالَ رَسُولُ اللَّهِ ﷺ الْمُؤْمِنُ لِلْمُؤْمِنِ كَالْبُنْيَانِ يَشُدُّ بَعْضُهُ بَعْضًا

: "Indeed (each) one of you is the reflection of his brother. So if he sees something harmful in him, then let him remove it from him."

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ أَحَدَكُمْ مِرْآةُ أَخِيهِ فَإِنْ رَأَى بِهِ أَذًى فَلْيُمِطْهُ عَنْهُ