Mukhtasar Muslim

Abu Huraira (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: "You will not enter Paradise until you have faith, and you will not have faith until you love one another. Shall I not tell you something which, if you do it, you will love one another? (So for this) spread peace (greetings of Salam) among yourselves."