Hebrews 9:22

In fact, under the Law, almost everything is purified with blood, and unless blood is poured out nothing is forgiven.

Hebrews 10:4-12

for bulls' and goats' blood is powerless to remove 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
In fact, under the Law, almost everything is purified with blood, and unless blood is poured out nothing is forgiven.
Hebrews 10:4
for bulls' and goats' blood is powerless to remove sin.