Hebrews 10:2

Otherwise would they not have ceased to be offered? Because the worshippers having been once cleansed, would have had no more consciousness of sin.

Hebrews 9:13-14

For if the blood of bulls and goats and the ashes of a heifer sprinkled on those who have been defiled, sanctify to the cleansing of the flesh,

Hebrews 10:17

Then he adds, And their sins and their iniquities will I remember 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
Then he adds, And their sins and their iniquities will I remember no more.
Hebrews 9:13
For if the blood of bulls and goats and the ashes of a heifer sprinkled on those who have been defiled, sanctify to the cleansing of the flesh,

General references

Hebrews 10:18
But when these have been remitted, there is no more any offering for sin.