Hebrews 10:2

For in that case would they not have ceased to be offered, because the worshippers, having been once purified, would have had no more consciousness 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, sanctify to the purifying of the flesh,

Hebrews 10:17

and their sins and 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
and their sins and iniquities will I remember 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, sanctify to the purifying of the flesh,

General references

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