Hebrews 10:10-14
By the which will we are sanctified through the offering of the body of Jesus Christ once for all.  And every priest standeth daily ministering and offering oftentimes the same sacrifices, which can never take away sins: But this man, after he had offered one sacrifice for sins for ever, sat down on the right hand of God; From henceforth expecting till his enemies be made his footstool.  For by one offering he hath perfected for ever them that are sanctified.

The offering of Jesus of Himself was once and for all.  It was not to be like the temple sacrifices offered daily and yearly and for every sin, constant reminders to the people of their sinfulness and the need for forgiveness.  The insufficiency of those other sacrifices is contrasted with the all-sufficiency of Christ’s sacrifice.  They couldn’t do in actuality what they symbolically did, but Jesus’ sacrifice did that impossible work of taking away sins.

And now Jesus’ work is finished.  The high priest of the Old Testament had nowhere to sit down.  His work was constant and continual because sin yet remained.  But Jesus takes His seat and His worthy place because His work is done.  He completed what He set out to accomplish.  He was obedient to the cross, and then He rose in victory.  He accomplished the work of redemption so that we could be made free.

This one offering of Christ, blood shed and body broken, perfects forever those who are cleansed by it.  Those who believe in Christ never lose their salvation.  They never regain their sins.  And what Jesus accomplished can never be undone.  Forever we who trust Christ are made whole and complete in Him, and our sins are separate from us.  There are no other sacrifices required to secure our salvation.

The work of Christ accomplished what thousands of sacrifices never could.  His work was accomplished with finality.  So there is nothing more for us to do but to accept it by faith.  We trust what Jesus did on our behalf.  We trust that that is enough.  And when we’re saved, we can trust that that gift is ours forever.  May we rest in the completed work of Christ and trust fully in His sacrifice that takes away our sin once and for all.