'Agent' in the Bible

Then Absalom would say to him, “See, your claims are good and right, but there is no man appointed as the king’s agent to listen to you.”

Rescue my life from the sword,My only life from the paw of the dog (the executioner).

See our shield, O God,And look at the face of Your anointed [the king as Your representative].

behold (hear this), I will send for all the families of the north,’ says the Lord, ‘and I will send for Nebuchadnezzar king of Babylon, My servant [to enact My plan], and I will bring them against this land and against its inhabitants and against all these surrounding nations; and I will utterly destroy them and make them a horror and a hissing [that is, an object of warning and ridicule] and an everlasting desolation.

‘But the vine was uprooted in [godly] wrath [by His representative]And it was thrown down to the ground;The east wind dried up its fruit.Its strong branch was broken offSo that it withered;The fire [of God’s judgment] consumed it.

But as it is, Christ has acquired a [priestly] ministry which is more excellent [than the old Levitical priestly ministry], for He is the Mediator (Arbiter) of a better covenant [uniting God and man], which has been enacted and rests on better promises.

and to Jesus, the Mediator of a new covenant [uniting God and man], and to the sprinkled blood, which speaks [of mercy], a better and nobler and more gracious message than the blood of Abel [which cried out for vengeance].