'Representative' in the Bible

As for me, I will be living in Mizpah as your representative before the Chaldaeans who come to us: but you are to get in your wine and summer fruits and oil and put them in your vessels, and make living-places for yourselves in the towns which you have taken.

Word has come to me from the Lord, and a representative has been sent to the nations, to say, Come together and go up against her, and take your places for the fight.