Envy and hatred and lack of love between a nation is what severs the religion
TIRMIDHI 2510:
from al-Zubayr b. al-ʿAwwām —
that the Prophet ﷺ, "The disease of the nations before you is creeping towards you: Envy and hatred ˹growing among you˺, it is the haliqah (razor). I'm not speaking of what shaves the hair, rather what severs the religion.
By the One in Whose Hand is my soul (Allah), you will not enter Paradise until you believe, and you will not believe until you love each other. Shall I tell you about what will strengthen that ˹love˺ between you? Spread ˹the greeting of˺ salam among each other."
الترمذي ٢٥١٠:
عن الزبير بن العوام —
أَنَّ النَّبِيَّ ﷺ قَالَ: «دَبَّ إِلَيْكُمْ دَاءُ الأُمَمِ قَبْلَكُمُ: الْحَسَدُ وَالْبَغْضَاءُ، هِيَ الْحَالِقَةُ! لاَ أَقُولُ تَحْلِقُ الشَّعْرَ، وَلَكِنْ تَحْلِقُ الدِّينَ۔»
«وَالَّذِي نَفْسِي بِيَدِهِ لاَ تَدْخُلُوا الْجَنَّةَ حَتَّى تُؤْمِنُوا، وَلاَ تُؤْمِنُوا حَتَّى تَحَابُّوا۔ أَفَلاَ أُنَبِّئُكُمْ بِمَا يُثَبِّتُ ذَاكُمْ لَكُمْ؟ أَفْشُوا السَّلاَمَ بَيْنَكُمْ۔»