Allaah the Most High
says:
إِنَّمَا الْمُؤْمِنُونَ إِخْوَةٌ فَأَصْلِحُوا بَيْنَ أَخَوَيْكُمْ وَاتَّقُوا اللَّهَ لَعَلَّكُمْ تُرْحَمُونَ
“Indeed all the believers are brothers. So make reconciliation between your brothers, and fear Allâh, that you may receive mercy.”
(Al-Hujurat
49:10)
Imaam A-Sa'di said:
"This is a bond that Allaah has concluded between the
believers, that if there is an individual whoever he may be, whether in the
east of earth or its west, that has belief in Allaah and his Angels and his
Books and his Messengers and the Last Day then indeed he is a brother of the
believers, a brotherhood that necessitates that the believers love for him what
they love for themselves and that they dislike for him what they dislike for
themselves, and due to this the Prophet صلّى اللَّهُ
عليه وسلّم said ordering the believers with brotherhood based on Eeman: