Greek

καὶ ἐὰν ἐκεῖ ⇔ ᾖ υἱὸς εἰρήνης ἐπαναπαήσεται ἐπ’ αὐτὸν ἡ εἰρήνη ὑμῶν εἰ δὲ μή¦γε ἐφ’ ὑμᾶς ἀνακάμψει

Transliterated

kai ean ekei ē huios eirēnēs epanapaēsetai ep’ auton hē eirēnē hymōn ei de mēge eph’ hymas anakampsei

Literal English

And if there he might be son of peace will rest in him the peace you if however otherwise against you it will return
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