Hebrews 10:2

For then would not the sacrifices have ceased to be offered, because the consciences of the worshippers--who in that case would now have been cleansed once for all--would no longer be burdened with sins?

Hebrews 9:13-14

For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have contracted defilement make them holy so as to bring about ceremonial purity,

Hebrews 10:17

He adds, "And their sins and offences I will remember no longer."

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
He adds, "And their sins and offences I will remember no longer."
Hebrews 9:13
For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have contracted defilement make them holy so as to bring about ceremonial purity,

General references

Hebrews 10:18
But where these have been forgiven no further offering for sin is required.