'Mediator' in the Bible

those who, with their speech,accuse a person of wrongdoing,who set a trap at the gate for the mediator,and without cause deprive the righteous of justice.

"I, the Lord, officially commission you; I take hold of your hand. I protect you and make you a covenant mediator for people, and a light to the nations,

This is what the Lord says: "At the time I decide to show my favor, I will respond to you; in the day of deliverance I will help you; I will protect you and make you a covenant mediator for people, to rebuild the land and to reassign the desolate property.