A.T. Robertson Commentary Luke 10:6

"And if a son of peace be there, your peace shall rest upon him: but if not, it shall turn to you again." — Luke 10:6 (ASV)

A son of peace (υιος ειρηνης). A Hebraism, though some examples occur in the vernacular Koine papyri. It means one inclined to peace, describing the head of the household.

Shall rest (επαναπαησετα). Second future passive of επαναπαυω, a late double compound (επι, ανα) of the common verb παυω.

It shall turn to you again (εφ' υμας ανακαμψε). Common verb ανακαμπτω, to bend back, return. The peace in that case will bend back with blessing upon the one who spoke it.