Hebrews 8:6
"But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises."
Cross References (ranked by relevance)
By so much was Jesus made a surety of a better testament.
And to Jesus the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than that of Abel.
Whereby are given unto us exceeding great and precious promises: that by these ye might be partakers of the divine nature, having escaped the corruption that is in the world through lust.
Likewise also the cup after supper, saying, This cup is the new testament in my blood, which is shed for you.
In hope of eternal life, which God, that cannot lie, promised before the world began;
Who are Israelites; to whom pertaineth the adoption, and the glory, and the covenants, and the giving of the law, and the service of God, and the promises;