'Ambassador' in the Bible

A wicked messenger falleth into evil, And a faithful ambassador is healing.

As a vessel of snow in a day of harvest, So is a faithful ambassador to those sending him, And the soul of his masters he refresheth.

A report I have heard from Jehovah, And an ambassador among nations is sent, Gather yourselves and come in against her, And rise ye for battle.

Thus said the Lord Jehovah to Edom, A report we have heard from Jehovah, And an ambassador among nations was sent, 'Rise, yea, let us rise against her for battle.'

for which I am an ambassador in a chain, that in it I may speak freely -- as it behoveth me to speak.