Cross reference
Hebrews 10:18
18 Now where there is forgiveness of these, there is no more offering for sin.
Hebrews 10:2
2 For if this had been possible, would there not have been an end of those offerings, because the worshippers would have been made completely clean and would have been no longer conscious of sins?
Hebrews 10:14
14 Because by one offering he has made complete for ever those who are made holy.