Hebrews 10:2

since in that case would they not have ceased being offered, because the worshipers having once been purified would have had no more conscience of sins?

Hebrews 9:13-14

For if the blood of goats and bulls, and the ashes of a heifer sprinkling those who have been defiled, sanctifies unto the purification of the flesh;

Hebrews 10:17

and I will remember their sins and iniquities no more.

Treasury of Scripture Knowledge

Summary

For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins.

General references

Bible References

Once

Hebrews 10:17
and I will remember their sins and iniquities no more.
Hebrews 9:13
For if the blood of goats and bulls, and the ashes of a heifer sprinkling those who have been defiled, sanctifies unto the purification of the flesh;

General references

Hebrews 10:18
But where there is removal of these, there is no more offering for sin.