Hebrews 10:2

Otherwise, would they not have ceased to be offered? If the worshipers had once been cleansed, they would no longer have any 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 for the cleansing of the flesh,

Hebrews 10:17

then he adds, "Their sins and their lawless deeds I will 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, "Their sins and their lawless deeds I will 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 for the cleansing of the flesh,

General references

Hebrews 10:18
Where there is forgiveness of these, there is no longer any offering for sin.