Muslims should greet each other by saying “As-Salaamu Alaikum”. One should respond with “Wa-Alaikumus Salaam”. The response of Salaam has the similar reward as of saying salaam. Saying salaam is the Sunnah but its response is a Fard. Our beloved Prophet Muhammad (SAW) said: “The person closest to Allah is the one who precedes others with greetings” (Abu Dawud). The greeting is one of the best things in Islam as Holy Prophet (PBUH) made spreading of Salaam a part of faith.