Spreading Salams: A Source of Love among 
          Muslims
        The Prophet (peace be upon him) has taught Muslims the most unique 
          and beautiful method of greeting each other: "By 
          Him in Whose Hand is my life, you shall not enter paradise until you 
          believe. And you will not believe until you love each other. And, shall 
          I not lead you to something, that if you did, you would begin to love 
          each other? Spread the greeting of Salam among yourselves!" 
        
        Therefore, if someone greets you, "As-Salamu Alaykum" (peace 
          be with you), either you respond with similar words, "Wa-Alaykum 
          as-Salam" (peace be with you too), or with something more, "Wa-Alaykum 
          as-Salam wa-Rahmatullahi wa-Barakatuh" (peace, and the Mercy of 
          Allah, and His Blessings be upon you). Hassan (may Allah be pleased 
          with him) said, "While initiating the Salam is strongly recommended, 
          its reply is obligatory (wajib)."
        Imam al-Shafi reported that Abdullah ibn Umar (a well-known companion 
          of the Prophet) used to sometimes visit the market place with no intention 
          other than to say Salam to people there.
        Majid Al-Daryabadi quotes a British woman, fascinated by this unique 
          tradition of extending Salams among Muslims: "these gentle words 
          of greeting each other as they pass, is a music to the ear. It is amusing 
          to watch the dexterity with which two friends will sustain a competition 
          in greeting - each endeavoring to outdo the other in compliments... 
          master and the servant, the rich and the poor, the learned and the unlettered, 
          great each other with the same dignity on both sides, leading to no 
          loss of self-respect to either."
        Compiled From:
          "Tafsir Ishraq Al-Ma'ani", Sayyid Iqbal Zaheer, Vol II