Sayyiduna Abu Hurairah (may Allah be pleased with him) narrated from the Messenger of Allah (peace and blessings be upon him), he (peace be upon him) said: "By Him in Whose hand is my soul! You cannot enter Paradise until you become believers. And you cannot become believers until you love one another. Shall I not tell you about something which, if you do it, love will grow among you?" They said: "Yes, O Messenger of Allah!" He (peace be upon him) said: "Spread salam (greetings of peace) among yourselves."
Hadith Referenceمسند اسحاق بن راهويه / كتاب البر و الصلة / 800
Hadith Takhrij«مسند ابي يعليٰ ، رقم : 6550 . قال حسين سليم اسد : اسناده ضعيف .»