Hadith on Love: You will not enter Paradise until you love each other for the sake of Allah

Abu Huraira reported: The Messenger of Allah صلى الله عليه وسلم said, “You will not enter Paradise until you believe and you will not believe until you love each other. Shall I show you something that, if you did, you would love each other? Spread peace between yourselves. ”
[Sahih Muslim, Book 1, Number 96]
Book of Faith, Chapter: Clarification that none will enter Paradise except believers and that love for believers is part of faith and spreading peace is a means to achieve that

عَنْ أَبِي هُرَيْرَةَ قَالَ  قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا تَدْخُلُونَ الْجَنَّةَ حَتَّى تُؤْمِنُوا وَلَا تُؤْمِنُوا حَتَّى تَحَابُّوا أَوَلَا أَدُلُّكُمْ عَلَى شَيْءٍ إِذَا فَعَلْتُمُوهُ تَحَابَبْتُمْ أَفْشُوا السَّلَامَ بَيْنَكُمْ

صحيح مسلم – كِتَاب الْإِيمَانِ – باب بَيَانِ أَنَّهُ لَا يَدْخُلُ الْجَنَّةَ إِلَّا الْمُؤْمِنُونَ وَأَنَّ مَحَبَّةَ الْمُؤْمِنِينَ مِنْ الْإِيمَانِ وَأَنَّ إِفْشَاءَ السَّلَامِ سَبَبًا لِحُصُولِهَا