'Mediator' in the Bible

"If there is a messenger beside him, a mediator, one of a thousand, to declare to a human being his uprightness

Why then the law? It was added on account of transgressions, until the descendant should come to whom it had been promised, having been ordered through angels by the hand of a mediator.

Now the mediator is not for one, but God is one.

For [there is] one God and one mediator between God and human beings, the man Christ Jesus,

But now he has attained a more excellent ministry, by as much as he is also mediator of a better covenant which has been enacted upon better promises.

And because of this, he is the mediator of a new covenant, in order that, [because] a death has taken place for the redemption of transgressions [committed] during the first covenant, those who are the called may receive the promise of the eternal inheritance.

and to Jesus, the mediator of a new covenant, and {to the sprinkled blood} that speaks better than Abel's [does].