Hebrews 7:27
who does not need, as did the Levitical priests, to offer sacrifices, first for his own sins and then for those of the people; this latter is just what He did once for all when He offered up Himself.
Hebrews 9:26
for, if that had been the case, He would have had to suffer over and over again, ever since the creation of the world. But, as it is, once at the close of the ages He has appeared, to put away sin by His sacrifice.
Hebrews 10:1-10
For since the law cast only a shadow of the blessings to come and did not possess the reality itself of those blessings, the priests with the same sacrifices that are perpetually offered year after year cannot make perfect those who come to worship.