You will not enter Paradise until you believe and you will not believe until you love one another. Shall I guide you to something which, if you do, you will love one another? Spread the greeting of peace among yourselves

The Prophet (may Allah's peace and blessings be upon him) clarified that none will enter Paradise except the believers, and faith will not be perfect and the Muslim society will not be in good condition unless they love one another. Then, the Prophet (may Allah's peace and blessings be upon him) guided us to the best means of spreading love, namely spreading the greeting of peace among Muslims, as Allah has made peace a greeting for His slaves.

1. Entering Paradise is contingent on faith.
2. Perfect faith entails that a Muslim loves for his brother what he loves for himself.
3. It is recommended to spread the greeting of peace and extend it among Muslims, as this results in spreading love and security between people.
4. The greeting of peace is to be extended only to Muslims, as the Prophet (may Allah's peace and blessings be upon him) said: "Among yourselves".
5. Extending the greeting of peace eliminates division, abandonment, and rancor.
6. The importance of love between Muslims, which is a part of perfect faith.
7. Another Hadīth mentions that the complete form of the greeting of peace is: "As-salāmu ‘alaykum wa rahmatullāhi wa barakātuh" (may the peace, mercy, and blessings of Allah be upon you); however, it is sufficient to say: "As-salāmu ‘alaykum" (peace be upon you).

صحيح مسلم (1/ 74) (54). بهجة الناظرين شرح رياض الصالحين، لسليم الهلالي (1/ 129). تطريز رياض الصالحين، لفيصل المبارك (ص515). شرح رياض الصالحين، لابن عثيمين (4/ 394). نزهة المتقين شرح رياض الصالحين، لمجموعة من الباحثين (1/ 661).