'Mediator' in the Bible

What then is the law? It was added because of transgressions, till the seed should come to whom the promise hath been made; and it was ordained through angels by the hand of a mediator.

Now a mediator is not a mediator of one; but God is one.

For there is one God, one mediator also between God and men, himself man, Christ Jesus,

But now hath he obtained a ministry the more excellent, by so much as he is also the mediator of a better covenant, which hath been enacted upon better promises.

And for this cause he is the mediator of a new covenant, that a death having taken place for the redemption of the transgressions that were under the first covenant, they that have been called may receive the promise of the eternal inheritance.

and to Jesus the mediator of a new covenant, and to the blood of sprinkling that speaketh better than that of Abel.