Hebrews 9:22

and indeed according to the law almost every thing is purified with blood, without the effusion of which, there is no remission of sins.

Hebrews 10:4-12

And indeed it is not possible that the blood of bulls and of goats, should take away the guilt of sin.

Treasury of Scripture Knowledge

Summary

Wherefore David said unto the Gibeonites, What shall I do for you? and wherewith shall I make the atonement, that ye may bless the inheritance of the LORD?

Bible References

Wherewith

Hebrews 9:22
and indeed according to the law almost every thing is purified with blood, without the effusion of which, there is no remission of sins.
Hebrews 10:4
And indeed it is not possible that the blood of bulls and of goats, should take away the guilt of sin.