'Representative' in the Bible

Then David said to all the assembly, “Now bless (praise, thank) the Lord your God.” And all the assembly blessed the Lord, the God of their fathers, and bowed down and honored the Lord and to the king [as His earthly representative].

Now let me sing for my greatly Beloved [Lord]A song of my Beloved about His vineyard (His chosen people).My greatly Beloved had a vineyard on a very fertile slope (the promised land, Canaan).

“Listen carefully, I have appointed him [David, representing the Messiah] to be a witness to the nations [regarding salvation],A leader and commander to the peoples.

To deprive a man of justiceIn the presence of the Most High,

“Speak to Zerubbabel governor of Judah, saying, ‘I am going to shake the heavens and the earth.

You learned it from [our representative] Epaphras, our beloved fellow bond-servant, who is a faithful minister of Christ on our behalf