Greet First with Salaam

Sayyiduna_ Abu Umaamah 

رضى الله تعالى عنه 

narrates:

رسول الله صلى الله تعالى عليه وسلم

said:

Verily, the best people to ALLAH TA'ALA, are those who are first to greet with Salaam (سلام)

(السلام عليكم ورحمة الله وبركاتة)

(Abu Dawood)