Verse 15. And for this cause. With this view; that is, to make an effectual atonement for sin, and to provide a way by which the troubled conscience may have peace.

He is the Mediator. See Barnes |Ga 3:19,20|.

He is the Mediator between God and man in respect to that new covenant which he has made, or the new dispensation by which men are to be saved. He stands between God and man -- the parties at variance -- and undertakes the work of mediation and reconciliation.

Of the new testament. Not testament -- for a testament, or will, needs no mediator; but of the new covenant, or the new arrangement or disposition of things under which he proposes to pardon and save the guilty. See Barnes |Heb 9:16,17|.

That by means of death. His own death as a sacrifice for sin. The old covenant or arrangement also contemplated death but it was the death of an animal. The purposes of this were to be effected by the death of the Mediator himself; or this covenant was to be ratified in his blood.

For the redemption of the transgressions that were under the first testament. The covenant or arrangement under Moses. The general idea here is, that these were offences for which no expiation could be made by the sacrifices under that dispensation, or from which the blood then shed could not redeem. This general idea may include two particulars.

(1.) That they who had committed transgressions under that covenant, and who could not be fully pardoned by the imperfect sacrifices then made, would receive a full forgiveness of all their sins in the great day of account through the blood of Christ. Though the blood of bulls and goats could not expiate, yet they offered that blood in faith; they relied on the promised mercy of God; they looked forward to a perfect sacrifice; and now the blood of the great atonement, offered as a full expiation for all their sins, would be the ground of their acquittal in the last day.

(2.) That the blood of Christ would now avail for the remission of all those sins which could not be expiated by the sacrifices offered under the law. It not only contemplated the remission of all the offences committed by the truly pious under that law, but would now avail to put away sin entirely. No sacrifice which men could offer would avail, but the blood of Christ would remove all that guilt.

That they which are called. Alike under the old covenant and the new.

Might receive the promise of eternal inheritance. That is, the fulfilment of the promise; or that they might be made partakers of eternal blessings. That blood is effectual alike to save those under the ancient covenant and the new -- so that they will be saved in the same manner, and unite in the same song of redeeming love.