قَالَ ﷺ: «لا تَدْخُلُوا الجَنَّة حَتَّى تُؤمِنُوا، وَ لَا تُؤمِنُوا حَتَّى تَحَابُّوا، أَوَلَا أدُلُّكُمْ عَلَى شَيْءٍ إذَا فَعَلْتُمُوهُ تَحَابَبْتُمْ، أَفْشُوا السَّلامَ بَيْنَكُمْ»

The Prophet \pbuh said: “You shall not enter paradise until you believe, and you shall not believe until you love one another. Shall I not inform you of something, if you were to act upon it, you will indeed achieve mutual love for one another? Spread the Salām amongst yourselves.”

Reference: The Prophet \pbuh said: “You shall not enter paradise until you believe, and you shall not believe until you love one another. Shall I not inform you of something, if you were to act upon it, you will indeed achieve mutual love for one another? Spread the Salām amongst yourselves.” Muslim (#54, 1/74).