Hazrat Abu Hurairah (may Allah be pleased with him) related that the Messenger of Allah (peace and blessings of Allah be upon him) said:
لَا تَدْخُلُونَ الْجَنَّةَ حَتَّى تُؤْمِنُوا وَلَا تُؤْمِنُوا حَتَّى تَحَابُّوا ، أَوَلَا أَدُلُّكُمْ عَلَى شَيْءٍ إِذَا فَعَلْتُمُوهُ تَحَابَبْتُمْ أَفْشُوا السَّلَامَ بَيْنَكُمْ
“You shall not enter Paradise until you believe, and you shall not truly believe until you love one another. Shall I not guide you to something which, if you do it, will cause you to love one another? Spread the greeting of peace among yourselves.”
[Sahih Muslim, Hadith 54]
