By him in whose hand my soul is, you will not enter Paradise until you believe, and you will not believe until you love one another: should I not guide you to something doing which you will love one another: spread out salutation among you. (Using translation from Abū Dāʾūd 5193)
قَالَ رَسُولُ اللهِ ﷺ وَالَّذِي نَفْسِي بِيَدِهِ لَا تَدْخُلُوا الْجَنَّةَ حَتَّى تُؤْمِنُوا وَلَا تُؤْمِنُوا حَتَّى تَحَابُّوا أَوَلَا أَدُلُّكُمْ عَلَى شَيْءٍ إِذَا فَعَلْتُمُوهُ تَحَابَبْتُمْ؟ أَفْشُوا السَّلَامَ بَيْنَكُمْ