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فَإِذَا دَخَلْتُم بُيُوتًۭا فَسَلِّمُوا۟ عَلَىٰٓ أَنفُسِكُمْ تَحِيَّةًۭ مِّنْ عِندِ ٱللَّهِ مُبَٰرَكَةًۭ طَيِّبَةًۭ
But, when you enter houses, give greetings of peace upon each other – a greeting from Allah , blessed and good ~ Surah An Nur 24:61
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Hazrat Abu Hurayrah Radiallahu Anhu said : that a man passed by Rasulullah Sallallahu Alayhi Wasallam whilst he was sitting with some others, and said “As-salamu ‘alaykum (peace be upon you).” Rasulullah Sallallahu Alayhi Wasallam said, “[He will have] ten hasanaat (10 rewards).”
Another man passed by and said “As-salamu ‘alaykum wa-rahmatullah (peace be upon you and the mercy of Allah).” Rasulullah Sallallahu Alayhi Wasallam said, “[He will have] twenty hasanaat (20 rewards).”
Another man passed by and said “As-salamu ‘alaykum wa-rahmatullahi wa-barakatuh (peace be upon you and the mercy of Allah and His blessings).” Rasulullah Sallallahu Alayhi Wasallam said, “[He will have] thirty hasanaat (30 rewards).”
~ Sahih Bukhari No. 986