Πέτρος Ἰουδαίοις τάδε πρῶτα τεθέσπικε πιστοῖς → Peter has laid down the following first writing for the Jewish faithful
agency: V. συναλλαγή, ἡ.
through the instrumentality of: P. and V. διά (acc.), Ar. and V. ἕκατι (gen.).