'Ambassador' in the Bible

A wicked messenger falleth into evil; but a faithful ambassador is health.

I have heard a rumour from Jehovah, and an ambassador is sent among the nations: Gather yourselves together, and come against her and rise up for the battle.

The vision of Obadiah. Thus saith the Lord Jehovah concerning Edom: We have heard a report from Jehovah, and an ambassador is sent among the nations. Arise ye, and let us rise up against her in battle.

for which I am an ambassador bound with a chain, that I may be bold in it as I ought to speak.