John Gill Commentary Luke 10:5

"And into whatsoever house ye shall enter, first say, Peace [be] to this house." — Luke 10:5 (ASV)

And into whatsoever house you enter
When you come into any city, town, or village,

first say, peace be to this house :
salute the inhabitants in the usual form, saying, peace be to you; wishing them all happiness and prosperity, temporal, spiritual, and eternal. This shows our Lord did not disapprove of civil salutations.