Hebrews 8:6
But now has he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established on better promises.
Torrey's Topical Textbook—AKJV

Hebrews 9:15
And for this cause he is the mediator of the new testament, that by means of death, for the redemption of the transgressions that were under the first testament, they which are called might receive the promise of eternal inheritance.
Torrey's Topical Textbook—AKJV

Hebrews 12:24
And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaks better things that that of Abel.
Torrey's Topical Textbook—AKJV