Hebrews 10: 11 - 18: For it is impossible that the blood of bulls and goats should take away sins.... (religion-online.org)
says the LORD; I have had enough of burnt offerings of rams and the fat of fed beasts; I do not delight in the blood of bulls, or of lambs, or of he - goats. (religion-online.org)
The idea wasn't that the blood of bulls and goats somehow «appeased God,» the sacrificial system was foreshadowing the time when God Himself would make the ultimate atonement for sins. (religion.blogs.cnn.com)