THE MOSAIC LAW IS ONLY A SHADOW, NOT THE REALITY, OF THE ONCE FOR ALL TIME SACRIFICE OF JESUS CHRIST FOR SINS
Verses 1-25 of chapter 10 declare the absolute superiority of the once for all time sacrifice of Christ for sins over the sacrificial practices of the Mosaic Law which were just the shadow, NOT THE REALITY, of our Lord's true and effective sacrifice for sins - the only action that is effective toward atonement for any sin. The passage then encourages the Hebrew believers to "hold unswervingly to [this sure] hope [of eternal life which] we [Hebrew believers] profess..."[of their salvation through a moment of faith in this once for all time sacrifice of our Lord, and not go back to the Mosaic Law practices]
(v. 1) "The Law is only a shadow of the good things that are coming - not the realities themselves. For this reason it can never, by the same sacrifices repeated endlessly year after year, make perfect those who draw near to worship.
(v. 2) If it could, would they not have stopped being offered? For the worshipers would have been cleansed once for all, and would no longer have felt guilty for their sins.
(v. 3) But those sacrifices are an annual reminder of sins,
(v. 4) because it is impossible for the blood of bulls and goats to take away sins.
(v. 10) And by that will [of God that His Son be sacrificed to atone for the sins of the whole world, (vv. 8-9], we have been made holy through the sacrifice of the body of Jesus Christ once for all.
(v. 11) Day after day every priest stands and performs his religious duties; again and again he offers the same sacrifices, which can never take away sins.
(v. 12) But when this Priest had offered for all time one sacrifice for sins, he sat down at the right hand of God.
(v. 13) Since that time He waits for His enemies to be made His footstool,
(v. 14) because by one sacrifice he has made perfect forever those who are being made holy.
(v. 18) And where these have been forgiven, there is no longer any sacrifice for sin." "