Unto governors (ηγεμοσιν). Dative again of ηγεμων, a leader (from ηγεομα, to lead), old and common word (Matthew 10:18).

As sent by him (ως δι' αυτου πεμπομενοις). Present passive participle of πεμπω. Δι' αυτου is "by God," as Jesus made plain to Pilate; even Pilate received his authority ultimately "from above" (John 18:11).

For vengeance on evil-doers (εις εκδικησιν κακοποιων). Objective genitive with εκδικησιν, for which see Luke 18:7.

For praise to them that do well (επαινον αγαθοποιων). Objective genitive again, αγαθοποιος, a late word (Plutarch, Sirach) from αγαθον and ποιεω here only in N.T. Found in a magical papyrus.