عَنِ الزُّبَيْرِ بْنِ الْعَوَّامِ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ دَبَّ إِلَيْكُمْ دَاءُ الْأُمَمِ قَبْلَكُمْ الْحَسَدُ وَالْبَغْضَاءُ وَالْبَغْضَاءُ هِيَ الْحَالِقَةُ حَالِقَةُ الدِّينِ لَا حَالِقَةُ الشَّعَرِ وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَا تُؤْمِنُوا حَتَّى تَحَابُّوا أَفَلَا أُنَبِّئُكُمْ بِشَيْءٍ إِذَا فَعَلْتُمُوهُ تَحَابَبْتُمْ أَفْشُوا السَّلَامَ بَيْنَكُمْ
Sayyiduna Zubair bin Al-Awwam (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: The disease of the previous nations will spread among you, and that disease is envy and malice. It is something that shaves off the religion; it does not shave off hair (rather, it destroys the religion). By the One in whose hand is the soul of Muhammad (peace and blessings be upon him)! You cannot be true believers until you love one another. Shall I not tell you something which, if you do it, you will love one another? Spread salam (greetings of peace) among yourselves.