Hebrews 7:27
one who has no need to offer sacrifices daily as those High Priests have, first for their own sins, and then for those of the People. For this he did once and for all, when he offered himself as the sacrifice.
Hebrews 9:26
for then Christ would have had to undergo death many times since the creation of the world. But now, once and for all, at the close of the age, he has appeared, in order to abolish sin by the sacrifice of himself.
Hebrews 10:1-10
The Law, though able to foreshadow the Better System which was coming, never had its actual substance. Its priests, with those sacrifices which they offer continuously year after year, can never make those who come to worship perfect.