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. 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.
Hebrews 10:1-3
For Christ died for sins once for all, the righteous for the unrighteous, to bring you to God. He was put to death in the body but made alive by the Spirit.
1 Peter 3:18
For Christ did not enter a man-made sanctuary that was only a copy of the true one; He entered heaven itself, now to appear for us in God’s presence…
nor did He enter heaven to offer Himself again and again, the way the high priest enters the Most Holy Place every year with blood that is not his own. Then Christ would have had to suffer many times since the creation of the world. But now He has appeared once for all at the end of the ages to do away with sin by the sacrifice of Himself. Just as man is destined to die once, and after that to face judgment, so Christ was sacrificed once to take away the sins of many people; and He will appear a second time, not to bear sin, but to bring salvation to those who are waiting for Him.
Hebrews 9:26-28