'Ambassador' in the Bible

A wicked messenger falls into hardship,But a faithful ambassador brings healing.

The vision of Obadiah.Thus says the Lord God concerning Edom—We have heard a report from the Lord,And an ambassador has been sent among the nations, saying,“Arise, and let us rise up against Edom for battle [with the Lord as commander]!”

for which I am an ambassador in chains. And pray that in proclaiming it I may speak boldly and courageously, as I should.

yet for love’s sake I prefer to appeal to you—since I am such a person as Paul, an old man, and now also a prisoner [for the sake] of Christ Jesus—